Because options matter.
We can have BOTH wireless and wired. There's a reason brands want you to only have one option, as wireless is more profitable for them. You can always use wireless, but you should have another option for emergencies or edge cases at the very least.
Try rolling back the driver and checking if that reverts this. Has happened to be before, and a rollback worked.
While 300-500 W is enough, there's no reason it should run lower than before unless specified by you in the settings.
It... depends.
Some do, some don't. Some have some models with custom PCBs, and some with the reference design by the OEM (AMD/NVidia/Intel).
That is absolutely possible and brands like NZXT make products for that niche! https://nzxt.com/product/kraken-g12
Did you check Disk Management which is also named Create and Format Hard Disk Partitions?
It could be just partitions and not extra drives! Worth a check!
Considering it is a 3070+5800X, maybe it is the power spikes that can cause issues on the 750W PSU?
This would probably also explain the AMD FX-390X working without issues since it has much lower power draw!
I think this video is great reference for this:
So... Mac Address topic?
And yeah, Apple gives you almost no control over anything. It's a compromise that you have to live with. They get to make their choices as they believe the user is too dumb to do that, which is surprisingly true in most cases and thus extremely effective.
If I understand this correctly, Wendell from Level1Techs has recently made a great video series on this.
Yes, it's slightly complicated, but there ARE easier ways of going about it.