There was a study a while back that found quarter squats translate to sprint power and jump height more than half/parallel squats do.
https://3cbperformance.substack.com/p/quarter-vs-half-vs-full-squats-which
But this was in experienced college athletes who already had a base and had already had a 1.5xBW half/parallel squat.
You can load up a quarter squat more than a half squat, so can develop more power at the top end of a squat. I've definitely seen footage of an NBA player doing quarter squats.
I don't know if deeper squats are good for injury prevention or something else, but I can imagine there's no reason for them to do lots of half squat volume like a bodybuilder would. No point doing extra training that isn't matched with your goals. They probably have a bunch of stability work, single-leg work, running, plyometrics and other stuff the average gym goer doesn't do, plus all their MMA training - takes a lot of time and a lot of recovery, both of which are limited resources.
I don't think top level athletes in most sports lift weights how modern recreational gym-goers do (compound lifts, starting strength type stuff).
Real madrid weight training - you can see how much variation they do, half of which would be in "what the fuck are you doing?" territory in an average gym. My dad played field hockey at near-international level as an adult, international masters level (even post-ACL tear), coached adults/youth for several years and when he used the gym he never compound lifts (could partly be due to being from an older generation).