Stubborn, maybe, but if it ain't broke
Stubborn, maybe, but if it ain't broke
“Ain’t broke” is a lot better of a description than “fittest”.
Evolution selects for the first thing that happens to work. It’ doesn’t have to work particularly well, only well enough to not die from it.
It’s also a local maxima trap. To shift to chewing, they would have to change both bite behaviour, and teeth structure. The intermediate stage is a lot worse than either style.
Even if chewing was the better option, it’s inaccessible from the crocs current method.