Overheating is not something that you discover only by shipping pre-production cameras to your ambassadors.
I think Canon may have made a PR mistake by announcing the R5 as if it were oriented primarily to the video crowd. It has set unrealistic expectations among people that are not particularly good at engineering.
I can see what you are saying. But also, just by looking at the R5 body we should be able to determine that it is a stills camera FIRST, even if video was focused on by Canon during promo. Heck, I can't blame them for touting to be the first to put 8k in a stills body format. I'd probably do it too. Also, most of us suspected this was the 5dmIV replacement, partly because of Canon choosing the naming scheme of 'R5',
and we all know the 5dmIV is primarily a stills camera with video capabilities. So why would we expect Canon to prioritize video over stills with its replacement when they
already have a competent line of video cameras they want us to buy?
But we should, and did (as adults using common sense) realize that putting that kind of technology into a body like that would possibly result in some heating issues. In fact, that was the very concern everybody had when Canon first announced that the camera was capable of 8k. I vividly remember people voicing concerns such as "There is no way they do that unless they add cooling!" OR "If they put 8k in a camera body it can only be done with the cripple hammer."
Well, we know now they didn't add any cooling, and there is a bit of a cripple hammer (albeit understandable) by way of record limits to protect the camera's delicate electronics. Which is STILL better than any of the other camera manufacturers out there today.
Canon's reward from it's fan base is people getting worked up because instead of having a big ol' fan mounted under it so it could record video all day long, chewing up expensive 1tb CFExpress cards (something they would DEFINITELY complain about), it'll only record for a short amount of time, still chewing up expensive 512GB CFExpress cards
.
From where I sit Canon is pushing the envelope beyond what anybody else is doing today with the introduction of the R5 AND R6. I'm happy about that and I won't bash them for it.
EDIT: I read a comparison somewhere (maybe in these threads) that made profound sense: Lamborghini makes fast cars and advertise tops speeds in excess of 200mph. But if you drove it full redline from a full tank of gas to empty (all things being equal, like the road being perfectly flat, etc.) something would likely break.