My suspected reasons
1 work/life balance
2 most of the company is not as amazing as you think
3 managers are still just managers
4 working in silicon valley with that cost of living
5 developers can be happier and make what they want working for themselves, doing consulting, freelance, or a startup.
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[ 3.5 ms ] story [ 7.4 ms ] threadCheck out Erik Dietrich's "Developer Hegemony"