Their data points are no less valid than yours.
The 1080p and 4k30...unless the latter was HQ mode...are "fluff" in the sense that we know the R5 can shoot them continuously in 85F weather even after overheating. They line skip and don't use very much processing power. How long did it have to cool before it could do a full 30m of 4k30hq or 4k60 again? Now tomorrow shoot stills for a while and switch to 4k30hq or 4k60: how much can you get?
That's part of the problem. It should have been much warmer, but the heat is getting trapped inside
Then you haven't looked at the reports.
If the camera can't meet expectations and user needs then people will go to other brands for solutions whether you think they are entitled or not. I would agree that continuous 8k / 4k60 / 4k30hq from a 45mp sensor would be unrealistic without a fan. But looking at the competition it is not unrealistic to expect acceptable recovery times, or to expect to be able to shoot stills all day and still have max or near max recording time.
It's like the cameras are insulated. That's a problem.
When user expectations are unrealistic, I don't know what any company can do. People interpreted the marketing as they could shoot 4K60/120 and 8K all day in any environment. Neither Canon R5 or any competition can do it. Canon was careless with marketing, the limits should have been part of the main bullets.
When people are posting hyped videos and getting paid to be talking heads and produce click bait- yes, their data points are sometimes less valid than a real customer. I have seen some of these "reviews" and a few are complete fools with no capability for intellect, making emotional content or deliberate sensationalism to make money. Some are not and make valid points. For the worst reviewers, their logical fallacies and amateur tests with poor reporting on sequence and conditions help no one. Then uneducated people who have little technical knowledge and no first hand experience go around parroting that bad info.
The narrative isn't good, you're absolutely right, but in large part because so many people are negative and prone to outrage these days. Canon has learned the hard way that the average buyer looking for the next big thing today is uneducated technically speaking, and thinks they can have everything in a tiny body. Most people know nothing about physics or how electronics technology actually works and think they are important for buying 'the best'. Where is the outrage that the Sony also over heats in several reviews? I own a Sony camera, so I'm no brand elitist. I just want rationality and objectivity.
You call my low resolution tests fluff but I was adamantly clear that I was testing for MY needs in a scenario that would envelope any scenario I would use for stills and casual video. I have a dedicated video camera for long shooting though. I also explained how ridiculous I think it is to expect a tiny mirrorless to ever be able to cool itself with high frame rate high resolution and IBIS combined, which you seem to agree with. The camera did more than what Canon said it would do for me, so that is enough for me. After about 20 minutes of cooling in an air conditioned room after a full auto shutdown, I had access to 4K60P again with no warnings or limits in the display. Regardless, I am not expecting this camera to do what I imagine or think I need, only what Canon tells me it can do which they did before anyone could buy it. They gave us the conditions their tests were run at and told us about this up front, which not every company does.
On thermals, industrial circuit parts are typically rated to 85°C worst-case use, processors and sensors may tolerate less. In a weather sealed tiny body with all the things these cameras are doing today, that temp is not far off unless the body can transfer heat to the air fast enough to stay ahead or in equilibirum thermally. Even reducing chip power consumption starts to become a minor slow down to the inevitable overheat. No one manufacturer is so far ahead they are going to solve that in a MILC with lots of data moving and compromises like weather sealing and IBIS that make cooling harder.
The heat may be mildly insulated from transfer to outside by weather sealing points but the body itself is the heatsink as Canon has said, and they used a specific magnesium alloy for this body to that end, since magnesium is not a great thermal conductor itself compared to copper. I assume the thermal paths are somewhat well designed
for its intended use but a tiny MILC body that uses the magnesium alloy for heat dissipation has too many hot thermals close together to move the heat out unless the body is cooled rapidly or the activity stays within intended use. If your heat sink is hot and so is ambient air, you cannot remove heat fast enough. If the source keeps producing heat, things get worse not better. I've done product testing professionally and I know plenty about cooling circuits; will leave it at that.
The newest competition from Sony is running 12MP. Their IBIS is weaker. Their bitrates lower. The heat source is already cooler. They may have a more effective heat sink, and less weather sealing to allow some minor passive heat loss. Of course it will run some amount longer with cool ambient air, but if you are not cherry picking your reviewers, there are already many reports that theirs overheats as fast or worse in certain hot conditions, but is somewhat better in cooler ambient air than the R5. It is also not great for stills.
I don't want people to be silent about concerns, but for people to be educated, fair and objective when they present them and stop being so emotional and bashing things with negativity and no real knowledge. I want real reasoning, not parroting paid reviewers, etc. If the product is not for you, I wish you the best with whatever, truly! Same for all the people I have disagreed with on this forum, I wish them the best. I also hope Canon can improve the situation, although I think contacting a company directly can be a great way to get a message to them rather than spewing into the aether. For me, the R5 already does what it was designed to do and I was ok with that at purchase. For people who cannot accept the performance as stated, I don't get that.