I have not seen anything conclusive showing that "having the camera on reduces record time". There have been a couple forum posters, but not a single reviewer that has demonstrated this that I've been able to find. It's certainly not been my experience to-date.
I know Armando mentioned it, and I thought both DPReview and the Northrups mentioned it. Whether you experience it or not will likely depend on ambient temperatures and sunlight exposure. Also possibly on settings like overheat control.
Also, I'm not sure what part of your background gives you the expertise in consumer products/engineering to suggest it would have been "minor to fix" this. We know "why" this is happening, and it's the fact that it's the sealed design of a 5D-class body and small size (combined with everything else that's generating more heat). By my estimation, solving this problem would require fundamental changes to the camera's design one way or another.
The competition doesn't have this problem. You could say "but they don't have 8k or 4k120" except this happens with oversampled 4k. And if you say "but they're not reading 45mp", the R6 has the same problem.
I have a relevant background but it doesn't matter whether I'm right or wrong about how "easy" the fix would have been in the design stages. (Admittedly I don't have a unit to tear down to try to prove/disprove my own statement.) What matters is that the competition is able to deal with this and do so in small, sealed bodies. (Well...in Sony's case we could debate the sealing. Never the less...)
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