Besides the reasons others have listed, imo indie quake-likes don't really do enough to differentiate themselves from quake itself. Sure, there are differences but they're the sort of things that are only going to mean anything to you if you're already an experienced quake player. I would bet money that a standalone successor to 6v6 TF2 has more of a chance of making it than something like diabotical.
In the AAA space arena shooters are very unappealing. Epic was working on a new unreal tournament and I wouldn't be surprised if they stopped development upon realizing that they could either work on this or work on a game that plays well on both PC and consoles. You could use cs or valorant as a counterexample here as they're both popular and unplayable on controller but there difference there is that that style of game has sustained it's population over the years at a level that ensures there are plenty of other people to play with that are also new. I also think those games have more transferable skills from a game like apex. Overwatch is the closest thing I can think of to a popular modern arena shooter and I do not think it would be anywhere near as popular for both gameplay and accessibility reasons if it was not controller friendly.