I think your looking at paint from a proffessional's perspective, Neal, which I undersand.
I'm in CR's corner on this one. They are correct. The vast majority of consumers use latex paint and not oil based paint. And there is a difference between brands as to how well they cover dark colors and how well they can be cleaned. For a typical family with kids and pets, how well a paint can be cleaned matters a lot. Different brands of paint have different cleaning characteristics.
Latex paints all dry in about the same time.