I have a Linux laptop which is actually a gaming laptop. Which is to say that it has plenty of power.

I'm getting the MacBook Air M2 to complement, possibly to replace this one. Because the Linux machine is an awkward one and its idle internal temperature is between 40-50C, which means that it will almost always heat up my lap.

I think there's a deep misunderstanding of what most people want when they use the word "fix" to describe hacks like this one.

are you telling me that apple does not know how to fix this or are they intentionally throttling their devices

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.

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