Reptilian muscles fatigue waaay faster than mammalian’s. That’s probably the reason why chewing doesn’t work for them. Also, the white muscle from reptiles is very good at giving explosive force, which is exactly what they are doing instead…

This is a physiological difference given their evolution. I remember it from college. Biologist here.

And . the same applies to why we can’t catch lizards, they are so fast… Right?.. until they aren’t. The trick to catch them is to make them run a little ;p