"Default" readily morphs into "only supported". Into "if you use something else and complain to IT when it breaks, IT addresses the issue by replying 'try using an editor from this century'."
To my knowledge the "default" editor has changed ~3 times in the past 5 years (fbide, atom, vscode) - and yet I've been using vim this whole time with no problems, and never had anybody suggest that I stop ¯\_(ツ)_/¯