Speed would be nice, but more than that I want it to also manage Ruby installs. I’m infuriated at the mess of Rubys and version managers.
I'm always surprised to hear this, and I want to be clear that I'm not trying to be dismissive in my comment. However, I've not encountered issues while juggling dozens of Ruby projects since around 2011, despite seeing many people's complaints over the years. Ten years ago I was using rvm, and I saw people sharing their issues with it, and listing reasons why rbenv and chruby are better. So I tried those, and my resulting workflow felt basically the same once I got used to the differences.
At this point I've used rbenv, rvm, asdf, mise, and one other whose name isn't coming to mind. Not to mention docker containers, with or without any of those tools.
I don't mean to project any particular complaint onto you, and I'm curious what part of it is infuriating? Each of the version managers I've used has functioned as advertised, and I'm able to get back to work pretty smoothly.
what exactly is your issue? I've been using rvm for a decade(?) without any major pain. Cross-language tools such as mise or asdf also seem to work ok.
I can relate to the "I wish we didn't need a second tool", but it doesn't seem like much of a mess.
Mise is the answer to this. I no longer use chruby/rbenv/rvm. And it manages multiple languages, project-local environment, etc.