In my experience, the developers of such applications discover their mistake pretty quickly after their apps start seeing wide use, when their users complain about /tmp filling up and causing failures. The devs then fix their code. That’s why we don’t see it often in practice.
I humbly disagree. We don't live in that utopia.
I don't see them echoing your concerns.
I guess for an scenario to be real everyone has to know exactly what's happening? They will know what caused it and they will all know how to properly report it even though I don't even expect a lot of people to know their system especially your average joe/dane nor do I expect them to even troubleshoot the issue if something were to happen. It doesn't really invalidate the scenario at all.
A fabricated scenario is itself pretty redundant. :)