Hero, emancipator, glue of a nation: Yes. But no one would mistake Abraham Lincoln for a sitting savant. Look at his stern, confident expression. Lincoln clearly doesn't mind being cemented for eternity in a straight-back armchair.
Visionary sitters like you and me? We have other plans. Plans in which chairs -- even your grandparents' La-Z Boys -- just do not suffice. Same goes for stools, couches and beds.
This isn't 1953.
The Post-Sofa Revolution has begun. Get off the cushion.