In extension to what the other commenter said, critical temperature that is listed is usually higher than the maximum operating temperature so it is safe to run at the maximum.
It is safe only because it throttles heavily. Shutdown temperature is just 5 degrees higher btw.
At 100 the processor is at high risk of damage, which is why there's a built-in throttling mechanism.
Just imo, if it was safe it would be running at full speed (or at least max base clock) at that temperature.
As someone else said, they're made for burst operation these days, but again, that does not excuse manufacturers using subpar cooling.
I can see the majority is fine with it, but I'm not. A 15-25% failure rate in 2 years would make any other product a rotten lemon. But somehow it's acceptable for computers. Probably because people replace them every 2 years regardless, which is another insanity on its own.
I personally run my hardware for longevity (larger PSU, good temperature ranges, minimal overclocking, etc.) and upgrade every two years but I migrate my tech. downwards. Example: Gaming Rig -> Misc. Project/Guest PC -> NAS/Media Box. Working in tech. you very often make a salary that allows you to upgrade all of these rigs every year with no real consequences, but I think if nothing else we should be trying to reduce tech. waste. Semiconductor manufacturing has a large carbon footprint just like everything else.