Earlier quoted context omitted.
I'd assert that TV's are commonplace. This, just like the BBC Micro, ZX80/1 and C64, can easily be used with a TV.
The reason that the old '80s microcomputers were often plugged into TVs was that monitors were too expensive. Sharing the TV with every other device and person in the house was a necessary evil. TV-hogging is probably about as problematic now as it was then, while displays are much less expensive. So including a screen makes much more sense for a low-cost access-to-computing device these days.
It does call for a bit of scrounging, but an acceptable used monitor should be twenty bucks or free. Including a screen is optimizing for pessimism: the best you could do is something useless for the majority, and only as good/cheap as the minority could get a new one for.