Hmm... excuse me?
Linux kernel - most contributors use vim/emacs extensively, with some deep customizations.
Git - Linus developed it in his own heavily customized Emacs fork
Rust - Core team members use various customized setups
Postres - core devs use vim/emacs
Kubernetes - vim/emacs
What the fuck are you even talking about? Majority of high quality shit we use today - probably 90% of all C - from networking stacks - nginx, HAPoxy, OpenSSL, drivers; to compilers and languages; databases; web infra; cryptography; build systems, basically everything written before ~2010 that's still critical infrastructure was likely built by developers in vim/emacs.
All that stuff was developed by those craftsmen you're so dismissively mocking. Do you think they never customized their environments? Spending weeks perfecting configs instead of shipping is a discipline problem, not a tool problem.