Perhaps a finer wordsmith than I may be more convincing...The funny thing is Canon is lying about the overheating. The R5 can shoot 8K raw without issue. The overheating warning is driven purely by a timer. Actual temperature has nothing to do with it. Pull the internal coin cell battery and the timer is reset. Nothing to do with temperature at all. I’ve personally shot 8 hours straight with the R5 in 4K HQ and the body while warm was never uncomfortable to the touch. It’s all just deliberate firmware timer crippling to segment this amazing body from the Cinema line.
Here’s a link to where a user pulled the battery while constantly monitoring the cameras with a thermal imager.
Canon did it, they made a mirrorless that can shoot all day long in 8K raw... without overheating... and then they purposely crippled it.
Roger at DPReview