> Support for Apple M1 devices
For those skimming
The "env" tools are about managing the environment the (interpreted) application runs in. The "up" tools are about managing the compiler & toolchain of a language, and make no difference to the applications.
Of course someone will go and make pyup to manage Python versions without changing the environment just to increase confusion.
That said, I do think it has to do with the age and strategy used. Ruby and Python hark to the days of everything being global by default, and so these tools set up clean room environments. rustup doesn’t create an environment, it keeps track of various tool chains, and defaults their binaries to the appropriate one. Cargo dependencies are already local to the project, and aren’t “installed” globally like in older versions of those systems. So like, I think you’re spot on with the broader point, but rustup has always supported multiple tool chains well.
