This is largely a tradeoff between framerate and visual effects. Current generation consoles can make 60fps, but not with the level of visual effects that are expected from them. Whether or not this tradeoff is worthwhile is at least partially personal opinion (my opinion on the subject is... mixed, although I think the option should be available both ways).

Either way, it is undeniably harder to sell new consoles, or games for those consoles, when screenshots of them looks the same as it did in the previous generation, even if those screenshots were taken at 60fps.