Before we get to the limitations, here are the details on what’s new with Siri: First, the voice assistant can now control some third-party apps on your phone. You can send text messages through apps like WhatsApp or Slack using your voice — in the past, you could do so only with Apple’s own messaging app. Depending on which developers add Siri to their apps, you might also be able to use your voice to call a ride from Uber or Lyft, to pay someone through Venmo or to tell a fitness app to start tracking your workout.

Siri’s other new trick is Mac compatibility. You can now ask your desktop or laptop to search through your files or email, for instance.

These are all fine improvements. But I am struck by the deliberate way Apple is rolling them out. One problem is that the new Siri will not integrate with all kinds of apps. It will be able to control only a handful of app types, including messaging apps, ride-sharing apps, payment apps and fitness apps. Yet Siri won’t let you control music apps, for example — you can’t ask Siri to play a song on Spotify, a feature reserved for use with Apple’s own music subscription service.

This limitation could be relaxed with time. Apple reps told me the third-party integrations they had outlined so far were the start of a new effort — one that could be expanded to new app types in the future. Still, the lack of music support was a letdown. It’s hard to shake the suspicion that Apple is using Siri to give its own apps a leg up.

Another problem is that Siri is still hopelessly tied to each Apple device. Siri on your iPhone doesn’t really know anything about Siri on your Mac or Apple TV. On each device, Siri has different capabilities: On your iPhone it can call an Uber, if you have the Uber app installed, but Siri on your Mac can’t. Siri on your Apple TV can search YouTube for clips of Stephen Curry, but Siri on your iPhone can’t.

For now, this isn’t a big problem — you will learn what Siri can do on each device and adjust your queries accordingly. But that’s a curious thing to have to do. If Siri is an intelligent assistant, why does she need to be tied to apps you have installed on your device? Why can’t she call Uber from the cloud, regardless of which device you happen to be using?

The device-centric view gets particularly limiting when you think about asking your assistant complicated questions. For instance, what if you ask, “Can you see if there’s a room at my favorite Seattle hotel for my wedding anniversary weekend — and can you book it if it’s less than $200 a night?”