My opinion / guess from 20 years of watching Apple, is something to do with their values, principles and politics, along with PR or at least their projected image vs the actual image they have differs greatly.

We may hear more stories in the next few years. Either the woke took over, or the woke left.

Biggest complaints:

1) work were you perform difficult maintenance tasks, think debugging userland code from complete system dumps

2) challenging infrastructure

3) monopolization of power by established employees

Reality is that Apple willing to have 10x the typical staff for marginal gains. Being part of that can be difficult and boring.

Things change. Their products used to be so good they were considered as a standard for quality and usability. Few of the iconic companies of the past retain their status. Apple has sunk a long way; but, like IBM and Microsoft, though, there's a still a lot of air to fall through before they hit ground.