- dotnet-cli will try to cache a bunch of junk into its install folder, rather than respecting $XDG_CACHE_HOME, or even just using a plain old dotfile. These days it just generates an annoying warning on each run, but it used to be a hard error.

- OmniSharp just plain doesn't work on NixOS, because it hardcodes a bunch of Ubuntu paths.

- It seems to support automatically switching between multiple SDK versions, but I've never been able to get that to work.