School me, 3.79 strokers

Lots of interesting information, I am kind of wondering why the 3.79 has faded out of popularity verses the 4.00? I would not think it is because of options offered to other manufactures. An example would be the Chevy 383 (3.75 stroke) remains very popular, even though he 4.00 seems to the more prevalent with the Ford crowd. If the 3.79 worked well, why the shift to 4.00?