You are most welcome. I just so happen to be a hobbyist who has had my hands on almost every generation of Mac from the later 68k models to the Intel platforms

You are most welcome. I just so happen to be a hobbyist who has had my hands on almost every generation of Mac from the later 68k models to the Intel platforms up to around 2012. And I have booted NetBSD or some kind of Linux on almost all of them. They did not overheat or suffer any damage. In fact, my hottest running Macs in my collection, the G4 PowerBooks, run cooler under Linux than OS X 10.5 I still think you're grossly overstating the risks of modes of failure that just don't happen that often.