The cpu temps are one thing, but if - as you said - even a beast like the D15 G2 has it pegged at 100C, this very much sounds like bad ventilation and other parts of the system being toasted as well - VRMs in particular, for which the "PRIME" (actually being the low-end series) mainboards from Asus, as used here, don't exactly have a stellar reputation.

And yeah, having Arrow Lake running at its defaults is just a waste of energy. Even halving your TDP just loses you roughly 15% performance in highly MT scenarios...