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It can't be a "flaw" if it's gone 3 years without a fix.
I mean, I see a point where maybe MS thinks it would be better to lock this so users don't accidentally leave an org they are part off.
But there has to be a better way than this. I have multiple dead orgs and teams channels in my teams that I am part off but can't leave, because I don't have the permissions to leave them.