Sometimes you have to take a step down to step up. That’s what Google should’ve done with its open source PC operating system Chrome OS, which the corporation demonstrated Thursday.

Instead, Google is positioning Chrome OS against Microsoft with a lightweight OS shipping with netbooks next year. Chrome OS will function as a modified browser, enabling netbooks to handle everyday computing with web-based applications. That’s right: No native software, just the web.

The philosophy behind Chrome OS is extreme: Go the web way, all the way. It’s a “paradigm shift to make the web synonymous with the computer,” as Mashable’s Ben Parr puts it. But it’s an idealistic vision that could take several years to actualize, given the currently limited state of wireless connectivity and web-based applications. Google is aware of that, and the company is merely massaging us with this radical idea of a web-only computing experience by suggesting we try it on netbooks first.

Looking ahead, the company said it plans to share Chrome OS with more-powerful devices, including notebooks and desktops. But we doubt consumers will show much interest in a Chrome OS netbook the way Google is currently packaging it.

With Chrome OS, the search giant is pushing an OS that enables us to do less — even less than already low-powered netbooks can do. Web apps can’t let us process Microsoft Word documents, sync our iTunes libraries, or edit photos with Photoshop, for example. Thanks to their crampy keyboards and small screens, netbooks aren’t ideal for productivity apps such as Photoshop or Microsoft Word — but you’d be surprised at the different uses for netbooks that made them last year’s hit product category. Watch what happens when Google offers an OS that doesn’t at least provide the option of using the aforementioned apps.

Of course, as Google’s pitch goes, there are web alternatives to everything. Cloud storage for backups, internet-streaming music and video services, and the Google Docs web suite for all your spreadsheet or word-processing needs. The list goes on.

The idea is such: Give up the computing experience you’ve grown accustomed to for over a decade. Come live in Google’s browser.

Why would anyone wish to do that today, tomorrow or even next year when the OS ships?

Michael Gartenberg, a tech analyst at Interpret, sums up the state of computer use today better than anyone else: “What we’ve seen is most users are looking for a combination of the two: rich applications on my desktop, and the apps where I want to be connected.”

“This idea that I’m somehow going to do away with rich app architectures and do everything through the browser is an old argument, and it’s never taken root,” he added.

The benefits of Chrome OS don’t seem to outweigh everything Google’s modified browser will do away with. The pluses: Tight security, thanks to Google’s careful monitoring for malware in Chrome OS apps; saving the money you’d spend on an external hard-disk drive thanks to cloud storage; ultimately, being able to “stop worrying about your computer,” as Google said in a promotional video shown at its Thursday event.

Stop worrying about our computers? We’re worried about you, Google. T-Mobile Sidekick customers should especially be disenchanted with the cloud. Microsoft, T-Mobile and Danger hosted the data of all of T-Mobile’s Sidekick users in the cloud, and recently the server crashed, losing everything.

Nobody’s perfect, so it’s conceivable that the same thing could happen with Chrome OS. After all, Google’s Gmail service crashed in February and again in September this year. While no data was lost, it did cause hours of angst for people who had grown dependent on the mail service.

And then there’s money. Aside from losing access to the native apps we’ve paid for on our PC, it’s certainly imaginable that using Chrome OS could get expensive in general. If we wished to put an always-connected, web-app-only computer to good use, we’d need to purchase a data plan from a carrier. This could come in the form of an EVDO card or a smartphone tethering plan — in other words, a monthly bill. Google said Chrome OS will have caching features, so you won’t need internet access to do everything, but caching won’t provide the same offline experience as a full native application.

(Of course, our wireless problems could be solved if we could find an open Wi-Fi connection just anywhere we go. But unless you live in Mountain View, California, where Google provides free Wi-Fi, ubiquitous, free hotspots are not part of your reality.)

With all that said, there’s a ton of potential here for Chrome OS to be vastly appealing, and I’m keeping an open mind. To succeed with Chrome OS, Google should take a step down. To start, Google should modify Chrome OS into a “mini OS” of sorts that can live alongside another OS, such as Windows, on a netbook.

For comparison, Phoenix Technologies offers a mini OS called HyperSpace, which some netbooks are already shipping with. HyperSpace runs parallel to Windows as an instant-on environment, allowing netbooks to perform internet-centric functions without actually booting into Windows. Functions include multimedia players, browsers, internet telephony, e-mail and IM.

Sounds a lot like what Chrome OS is going to be, doesn’t it? That’s because it’s almost the same idea, only Phoenix Technologies is a lesser-known company (which developed the BIOS that boots many Windows computers today, by the way) and is taking a humbler approach — offering HyperSpace as an optional, complementary (but not complimentary) OS rather than a full-blown substitute for Windows. It’s an approach that could lead to greater results if embraced by an incredibly powerful brand like Google.

By offering Chrome OS as a free, downloadable mini OS that runs parallel to a full one, Google can still continue to expand its presence onto hardware — without having to sell the OS with netbooks. Consumers could still try out the benefits of Chrome OS and cloud computing when it’s convenient for them. Then, if users wished to boot into their primary OS to back up their data or do document processing with Microsoft Word, for example, they could — a hybrid, more feature-rich experience.

Unfortunately, not everything we want is on the web just yet. That’s not going to radically change in one year, and not even Google can change that.

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Photo: Melanie Phung/Flickr