Originally Posted by Bacciagalupe

Well, whatever works for you.

As with almost any tool or device, you wind up making compromises for the additional versatility. Often it is with fit and/or limited positions, often comfort, sometimes cost, sometimes stiffness, sometimes gearing, sometimes ride feel, sometimes other factors. (Rarely, if ever, do you really lose any performance.) Same thing with some full-sized bikes, by the way; my cross bike is highly versatile, but doesn't really excel at any one specific task.

I expect though that if you're in a tiny apartment in Japan, the compromises are well worth the space savings and other conveniences.