It is unimportant, if playback is going well. Similarly with CPU utilization. I am using computers intensively for decades and I didn't observe a relation between CPU/GPU utilization and longetivity.
Since computers are protected against overehating on more levels, you are not able to cause a damage by normal computer operation. The first level of protection is OS level with its thermal throttling. You would observe it as temporary stuttering in playback (maybe 10 - 15 seconds) and then playback continues without stuttering. As result of thermal throttling, no process is interupted, no data is lost, everything continues as run before. Of course, real time applications like HQPlayer, which cannot wait, are affected. That's the whole damage what can happen. If you are getting repeated series of dropouts with very high CPU/GPU utilization, thermal throttling si likely the reason. There are many apps which show CPU/GPU temperatures, it is appropriate to confirm the reason in such a case. If HQPlayer stutters in regular intervals but not in repeating series of dropouts, then it is not about thermal throttling but about insuccicient CPU/GPU clock speed for the requested real time operation.
So you would at first observe OS level thermal throttling as series of dropouts. Another level of thermal protection is part of chip design. If OS level thermal throttling would not be functional (did you hear about such a case?), or if it wouldn't be sufficient (it can happen under some circimstances), then processor level thermal shutdown would come into action. It is not possible to disable CPU/GPU thermal protection. This one of course means terminating everything what was running, without proper shutdown, so data loss could happen in the case of cached and not flushed disk write operations. But it still means no damage for CPU/GPU. Of course in such a case it is appropriate to look for a reason. Some hardware component may fail regardless on CPU/GPU utilization ...
Look for example
here:
"If a GPU hits the maximum temperature, the driver will throttle down performance to attempt to bring temperature back underneath the maximum specification. If the GPU temperature continues to increase despite the performance throttling, the GPU will shutdown the system to prevent damage to the graphics card."