I've never seen an IDE "mandated", I've seen officially supported development setups where you're on your own if you do anything different. Is that not the standard?
I've literally never seen this and I've been around for awhile. There's always people with some bespoke vim or emacs setup while everyone else is just using Jetbrains or VSCode or whatever, and nobody cares at all as long as that person is getting their work done.
