I only left it on once. It wasn't just warm. I was somewhat hot. Not enough for me not to be able to hold it though. But still, I would prefer mine cooler than that. Whenever I see a use for leaving it on, I will consider.
I still think Nintendo should fix this and I hope it is possible through a firmware update. I mean, just turn it on once in a while.
By the way, a shorter lifespan is not so noticeable. Therefore, there would be the "lack of evidence", as you say it. My evidence is that it is hotter than it needs to be.







