What is the rationale for not using a version manager to install everything else?

[ridhwaans]

mise has a big registry which includes terminal programs. The code does manual installation for some things like zellij and lazydocker
is mise reserved for dev languages?

[Kasui92]

Yes, it might make sense to use MISE to install other packages or applications as well... but I think separating the concepts might be a more valid solution.

Using MISE only for development languages ​​and pushing the use of binaries, compiled files, and other things for apps will help maintain familiarity with both.