Think of it this way. If Bitcoin were ever used as a normal currency (and this is seeming more and more like a long shot), you'd go to your coffee shop and say, "One coffee, please," and the barista would say, "That'll be .00057." If you buy a domain name using Bitcoin today, the service will ask you to pay .00274, give or take a decimal place. A pair of Yeezys costs .0568 BTC. Even if you paid your rent in Bitcoin, which is most people's largest lump sum expense in a month, it would still be just .3 bitcoin. If you really want to pay a whole bitcoin for something, you'd have to buy a used car. Practically speaking, with Bitcoin's present value it just doesn't make sense to treat a whole coin as the basic denomination and break it down from there.