I think you're referring to direnv as opposed to devenv.sh which does compete in the same space. Numentide was working on one too.

I am using devenv.sh at work, at home I just nix develop (but this doesn't do services, but there was a flake util just announced that adds support for that I need to check out).

I think you're discussing direnv, not devenv -- which appears to be a direct alternative to Flox

IMO it's a bit more like asking the python community to standardize all the tools listed in this stackoverflow question, which they only sort of succeeded in.

"What is the difference between venv, pyvenv, pyenv, virtualenv, virtualenvwrapper, pipenv, etc?"

https://stackoverflow.com/questions/41573587/what-is-the-dif...

Well, I wonder about all language communities why they don’t coordinate efforts indeed. I see monthly arrivals of new ‘js runtimes’ and package managers as well. And that eco system is a lot larger than nix. If these talented people would band together, wouldn’t we get a better endresult as a whole? If it’s commercial products then that doesn’t work, but this is all nice open source under good licenses, so outside ego, what’s the benefit of 50000 things that do the same thing except 499XX*n hours of life wasted?