- Provide an easy way to install the Nim compiler and tools.

- Manage multiple Nim installations and allow them to be selected on-demand.

The first one I already get with the package manager I use for everything else. The second one I don't really care about as a normal user: I just need the one version at a time. As much as possible, I would rather stick with one way of managing tools rather than having sub-managers that I interact with infrequently and have to remember each time. (The same applies for me to other ecosystems, like Python.)

I'm sure it's useful for people who are working on nim itself, but speaking personally, choosenim actually has negative utility.