Der8aur already showed how 4090 was pushed beyond optimum efficiency on launch day itself.
My cousin works as GPU architect in nVidia and will be talking about this stupid decision when we meet in few weeks time.
Are you sure your cousin is work on NVIDIA as GPU architect?
Before They decided the ideal power for 4090, they already tested and made more than 1000x attempted with some un-ideal conditions to make sure this GPU run as stable as it can with its all features activated (full Ray Tracing function, heaviest rendering workload, etc.)
And if your cousin truly working on nVIDIA GPU R&D dept. ; then actually he know that this "450 watt" actually was already the "win win solution wattage" value (rather than 600watt peak) to make everybody happy
Do not always trusted some kids or media with their controversial news to get more attention. They test it with what condition? as Cyberpunk with RTX ON already hit more than 450watt for make sure its running stable on that workload. And many render condition that actually need more wattage than that.
You can tell this to your "virtual cousin"
so he can tell that "every team member are moron and stupid" in the morning meeting. LMAO!