Not a surprise. When senior devs leave an org due to mismanagement or other reasons, it creates more work for those left behind. And it's become extremely difficult to find replacement for the seniors that left. Senior devs are nowhere to be found through regular applicant pipelines. They seem to be leaving as a result of reaching out to friends/former colleagues. Also relevant: - https://news.ycombinator.com/item?id…
Now if this dev left because he or she was an asshole and everyone hated working with them then it could be a net net positive or even if on the whole is negligible then that’s a win in terms of team morale and productivity.