Not taking sides here... because I see both.
At an academic level...
It is interesting that the time-out can be reset by forwarding a day (won't get into how silly it is to have dates wrong on your videos). This is basically a different take on battery pull trick... Except instead of not writing the timeout, it tricks to think the timeout is over. It's actually closer to getting around video game timeouts.
The user level...
By all rights do it to your camera if you want (it's your camera). Don't do it to a camera you have no intention of keeping. Be honest when selling your camera. If when you sell your camera you say 'yeah, I bypassed the overheat control on a regular basis' more power to you. But let's be honest here... almost no one would do that... so you get the next situation.
The resale market...
There is a general concern what the people do with these cameras that they ran hard and get rid of, and the negative experience the unknowing end user will have. Which might trickle down to the general statement of 'all used r5's are garbage', which will then hurt peoples ability to upgrade, which then has an effect on new model sales.
I almost cringe for every fly by night YT'r that does the old 'reason I'm getting rid of the R5'... I mean seriously... we all know why. Most got the camera for a quick click generator and have no intention of keeping it when the credit card bill comes due... so no skin off their back to abuse it as they see fit. The problem is how many of these camera's get repackaged and resold to the general public again (that they think is new or a lightly used return). This is not limited to the R5's... I think it happens a lot w/ any new first-batch tech (think of those that overclock video cards, and return them).
IMO...
Canon screwed up here... they should have done a power-on sensor thermal check to check the actual temp of components, shell, etc. and adjust cool down times based on that. Yes that would have added more temp sensors to the build... but it would have been better than the 'hmm it should be cooled off enough after 3 hours, I mean 1hr, or w/e we guess in the new firmware'. But the point is Canon is trying to prevent you from damaging your gear (heck if nothing else but for reliability (for reputation) and ultimately service reasons(for warranty repairs)).