I'm aware of that approach for Python, and Bundler can be configured to do a similar thing for Ruby. Those are good approaches for development environments (though I generally prefer Docker for those these days), but for system tools I think that's just kind of a hassle and I don't want to do it.

For a tool I install & use, my happy path is "install it with my package manager, and then stop thinking about it". Upgrades will happen whenever I decide to ask my package manager to upgrade everything. (I use Arch Linux, so that's usually once or twice a week.)

Needing to hand-setup an installation or deal with multiple package managers like that for a program makes me cranky. I've certainly done it when there wasn't a good alternative (and also occasionally wrap programs in docker containers as well if it's easier - https://github.com/wfleming/dockerfiles), but it's the kind of thing that makes me pause and reconsider whether I really care enough to use whatever the program is.