AEGs CAN suffer joule creep, but it is rare and not nearly as extreme. It's unlikely to be an issue. As for other platforms, such as HPA, think of it like this; there's a safe joule limit, which is equal to the FPS versus BB weight chrono'd with, if your gun goes over for any reason, then you are over limits. Some GBBRs can swing 10 - 80 FPS, add that to joule creep from higher weight BBs and there's a serious problem. You, as the player, are 100% responsible for your gun and to make sure your gun stays within the safety rules at all times. Joule wasn't as common as GBBRs are/were all over the place. All HPA units I have seen suffer from it very consistently, though they don't temp swing as much. Same as temp swing is common in GBBRs, but joule creep is unstable in some units.
If a field has X as their joule limit, then that's the limit period. You can't come out and go "oh well, my gun just doesn't behave itself" or "I have no idea what my gun will fire or how it will react, I guess I'll test it on all of your faces".
ďREALITY IS LIKE A STONE. TO MANY ITíS HARD AND COLD, THEY CANíT HUG IT OR EAT IT, IT ONLY FRUSTERATES THEM AND DOESNíT DO THEM MUCH GOOD. TO OTHERS ITíS STRONG AND DEPENDABLE, YOU CAN BUILD WITH IT, BUILD UPON IT, OR WORK WITH IT, ALSO USE IT TO SMASH PEOPLE IN THE FACE.Ē