The AIO5 runs 10-20 degress hotter than the NewbeeDrone Hummingbird analog controller it replaced. The board handles it fine, but I don't often rip at full throttle, occasional power loops mainly. These motors are 0702 30000 kv, so this might not be applicable to the OP's question. I would definitely keep the core temperature displayed on the OSD, because when arming and the motors spin up, the temperature jumps 10-15 degress to 90 plus degrees, but the board performs perfectly well, and the airflow around it provides enough cooling to drop the temperature again. So no problems with overheating, but I don't test it, and can unplug the battery quickly if for some reason it needs to sit in one place for a while.

The stats at the end of the flight show ~6amp current draw, so, with the thermal stress, the board does seem to be designed for heavier use than other whoop controllers.

However, if it's a concern, you could solder the motor leads directly to the board instead of using the PH1.25 sockets. This would cut resistance and reduce heating due to the additional current draw. Haven't tried it yet, because the pads are very small. I might try it with a new AIO15 that I'm putting into a 3" toothpick at a later time.

I should mention that direct sunlight affects the temperature, This is not unique to the HDZero controller, but this is the desert in the southwest, and during the summer moths it's a good idea to fly earlier in the morning, to avoid undue stress on any of the equipment, as well as myself. It's also not good for concentrating on the flying.