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Some company heads hoped return-to-office mandates would make people quit, survey says
(arstechnica.com)
This is a most excellent place for technology news and articles.
More and better options, more experience moving jobs (because beyond a certain point of seniority, expertise can only grow if you've seen a couple different ways of doing things, so you'll find that pretty much all top people have changed jobs at least a couple of times), higher income hence higher savings hence can handle any financial risks much more easilly, and more confidence in their own expertise.
They're better prepared mentally and financially to change jobs AND they're more in demand out there not least because they're a lot rarer and bring a lot more added value.