You're not helping your case by pointing out the platform's standard practice for installers is to use a language from the '70s that makes it trivial to write "rm -rf /", and (as that ticket indicates) the command will carefully work its way through all connected devices, including external drives.
You are not helping your case either by pointing out a dev's inability to handle a well documented language with known pitfalls that has been in use since the 70's.
If they can't write bash scripts there are a lot of options to install, update and remove software with built-in fail-safes.
I thought for sure SteamOS and the various Steam Machine “consoles” would create a critical mass, but it seems to just be going considerably slower than I would have predicted. I’m hopeful, but I don’t see the economics adding up right now