Nix UX really sucks I agree with that. But it has a very robust core model and is reproducible from the bottom up. Tools like asdf, renv etc. just provide you some binaries. If you need some system libraries installed they don't help with that for example.

Can one provide reproducible dev environment that uses a tool that is not yet in mise registry? Or does one need to wait it to be added into the registry? Also if I want to provide a python runtime that is compiled slightly differently can I do that? Or does it have to be distributed as a precompiled binary?

Have you tried devenv? What do you think?

thank you!