Oops. Forgot this fact. Intel controls Thunderbolt 4. USB 4 is just a subset. If it were not for Thunderbolt 4 and the fact that Intel is US based (firmware/bios) vs AMD which is worldwide, I would not even bother with Intel. If the shit hits the fan go with Intel.
Intel controls TB4, yes, but USB4 is based on TB3, which Intel donated to USB-IF, royalty-free for USB4 specification.
AMD is a US-based company. Not sure where everyone is getting this misinformation about AMD. Intel, AMD, and Nvidia are all US companies that also do business in China, though there are US restrictions and export controls on US silicon to China.
As for needing the PPM/X3D driver on dual CCD chips, I think it's necessary given the regression in CCD-to-CCD latency vs Zen 4. It's better to simply stop any depedent threads from being placed there, as the penalty is even higher now, if scheduler accidentally allows a cross-CCD thread placement. The CCDs have to communicate through IOD at the IMC/RAM, so it's always been wise to prevent any cross-CCD processing. Workloads should be decently parallel with no dependencies between CCDs. Gaming generally doesn't fit that workload type.