[hansword]

There is another consideration that people on YouTube ignore, but Apple doesn't.

You don't want the underside of the computer to reach substantially over 40deg for a considerable amount of time. This is because some people put their laptop on their lap and if it is too hot, it starts slowly cooking the leg. This has happened before, and thus nowadays, all new computers make sure the underside doesn't exceed 40deg for longer periods.

So I wouldn't be surprised if the people on YouTube traded performance for on-lap-safety. Apple can't, for obvious reasons.

[Someone]

A 60-ish degrees laptop, left on top of a table for hours, also may leave heat stains.