When there's nothing wrong with your device it shouldn't overheat while charging. I've three devices right now and the largest one has a thick rubber case and 11,000mah battery quick charging to 40W and 6Amps. It hasn't complained yet. Wireless charging is a different concept and it will heat up your device a lot. I stopped wireless charging except when I need a top up in the car.
I don't take off my case when I'm charging. I only charge wirelessly when needed (and when I'm in a cooler place). When I charge on the go using a powerbank, I keep them in separate compartments of my bag and I make sure not to use my device because I've noticed that it tends to heat up more (and faster).
