Over here in the real world of bottom 10% firing company cultures: those top engineers are leaving the company because they are tired of the culture of infighting and backstabbing, because setting up to others to fail and blaming them is just as effective as doing good work. Also, your super helpful generalist collaborator just got fired because everyone on your small team is highly performing and top down ruling was to fire 1/10 of each team.

I cannot think of a successful tech company that is still applying the GE 10% management style. It has consistently been shown to fail.