YMMV. I’ve seen issues in migration from Gitea to Codeberg. Always test first.

Rock star devs are just devs that know the code so can do it faster, probably because they wrote it. Some just hack shit in.

No one is good enough to justify those behaviours.

Cannot say I’ve seen a dev do that in the UK. Anyone would get fired for throwing a chair. Standing on the table yelling would probably get then a bollocking and maybe a warning.