Live view and mirrorless are the same, so I guess I don't get the differentiation.
What is different with the R5/R6 is the processor that is being used and the amount of processing power/threading it has to do, with the sensor data, and data throughput, coupled with deep learning/eye af.
These are the first 2 cameras to have such level of tech over any previous body, besides the 1DX3. The 1DX3 has more space inside and has more processors dedicated to various other things where that isn't the case with the R5/R6.
This is the root issue of the overheating showing itself to be more of a problem here than on any other body since the 40D. We all asked Canon to step up game over the R, saying it was an okay first offering, but they had to beat the competition. They really tried here, and succeeded in some aspects. But that comes at a cost.
MAC_daddy had set his camera on tripod and tethered it, and put it into Live View...it consistently overheated (Red thermometer, no White thermometer seen at all) on him, even in stills-only mode. This, in spite of others shooting stills-only (and not in Live View) not running into 'overheat'. So it seemed that Live View indeed was 'different' in some manner from EVF Stills-only mode. You had expressed this behavior recently, as well.
The fact that 'constantly energized sensor = Live View = mirrorless is exactly the reason why I raised the question about sensor overheat on many occasions, trying to find out if they figured out a way by bypass the issue, but no responses.
I do not dispute at all anything else you stated.






