Dunno, there are other aspects of environment variables that deteriorate the dev experience. They're very conducive to spooky action at a distance, since they're silently being passed along from parent-process to child-process (except when they aren't).

They can cause a lot of annoying bugs, and sometimes it's hard to track down where they are coming from (especially when dealing with stuff running in containers).

> except when they aren't

Like sudo for example.

So many problems related to that.