Even if they're not using Intel chips in the flesh, let's not forget that Intel donated thunderbolt to the USB-IF for USB4... so they're still using Intel's design, in spirit at least. Plus, by opening up thunderbolt to a broader audience, Intel paved the way for competitors to enter the market... I'm looking forward to when 3rd party USB4 designs come to docking stations and NVME SSD enclosures.
Would be interesting to know what change, if any, the non-Intel chips bring to the Mac. For example, USB3 speeds, or compatibility with TB4 docking stations? With respect to TB4 docking stations, Apple's M1 Pro/Max machines have a weird compatibility issue with certain TB4 docks...That is, when the system is restarted if the dock is attached and then the system subsequently goes to sleep, when it awakens from sleep, usb and thunderbolt devices attached to the dock may drop out... The solution with such docking stations is whenever you restart an M1 Pro/Max machine, briefly disconnect the dock and then hotplug it, and then it should function normally, and not have any issues during sleep / wake from sleep. I wonder if the new chips in M2 address this issue?