To be fair, I don't think it's such a huge sacrifice from the maintainers to put a check for leftover artifacts at the start of the installation script and nuke

To be fair, I don't think it's such a huge sacrifice from the maintainers to put a check for leftover artifacts at the start of the installation script and nuke those from orbit before proceeding. It can be put behind a confirmation Y/N terminal line as well. But yeah, usually bash install scripts are almost never idempotent. I feel the maintainers of those scripts just give up and IMO they really shouldn't.