Heat accelerates aging in electronics, but it's nothing to worry about so long as you're not constantly running it at maximum heat. I've accidentally left my 2018 MBP underneath a pile of blankets before while it was on and when I got back to it hours later, it was scalding hot. It's fine. I don't think you're going to outright break anything for using your equipment to its full potential. It'll add a little bit of wear and tear, but chances are that it probably won't ever result in anything negative that you'll see.