I'm a B-person.
Denmark, which I sometimes refer to as "the place the future comes from", gave me another reason to do so: the B-society.
Having just spent a year working a more or less 9-to-6 shift (we had "flex time" inasmuch we could arrive between 8:00 and 9:30), there's no doubt about it (if there ever was!), I'm a B-person.
One of the problem with being a B-person is the clash with the rest of society. Even if work lets me come in and do my hours whenever I want, there's shops, restaurants, and such. Having dinner at almost midnight can restrict choice a little bit, obviously! Social life can also be tricky. Although these is a natural clumping effect between people living similar lifestyles, they might not have as flexible work schedule. And I wouldn't even think of what things would be like with children! Ask anyone who's had to wake me up early in the morning...
But it would seems they're actually trying to tackle the issues, even having B-classes in school that start a few hours later. Just like the French had rules preventing abuse by employers asking employees to work later hours, they're picking up on the fact that, for some people it's asking them to not work later hours that is abuse. And that's the future.
P.S.: Also, in the same line of thought, why the 9 to 5 office worker will become a thing of the past. Not that it matters that much to me now, but I am curious to see how France will integrate that into its culture.