Take the Beelink M18, which doesn't have a single hole in the case but is made of metal, and it never runs any hotter than 65°C.
Every other plastic box I have received since runs around 80°C
The Beelink M18 has a small heat sink and also a rubber pad at the underside of the PCB that connects it to the bottom plate, which again doesn't have any holes or vents.
Remove the bottom plate and temperature will increase with about 10°C.
So it runs cool because it uses the whole casing as one big heat sink
What those manufacturers want these days is saving $1 by using a plastic case instead of metal, but if they would spend $1 more on a metal case the over heating problems would be solved.
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