They should only keep the engineers that remember how to solve leetcode hard problems /s
Have you ever interviewed with Facebook/Meta? They don't do leetcode problems. Say what you want about them as a company, but I've done quite a few interviews in my career and their process was one of my favorites.
It means reasonably complex algorithmic and data structure problems you're supposed to solve by coding under pressure, quickly, in interview conditions.
And if you think that's not happening, I have a bridge in Brooklyn to sell you.