I emphatically second this request to get some more PD device testing and fixing. I suspect it would only take analysis of one or two known-incompatible devices to find and fix whatever bugs in the EC/PD firmware are causing incompatibilities with most/all of the devices that are currently broken and it would be really nice!
@Woof, the performance issues you mention with that charger, you mention they were already happening with 3.03 and no change or worse with 3.04, is that right? PD passthrough even to the Framework adaptor doesn’t work with my hub, and between kernel 6.7 and 6.8 it went from merely “not working” (6.7) to “not working, and also, CPU performance tanks until I unplug the adaptor” (6.8), which sounds like what you describe, but I just wanted to confirm my understanding (to commiserate, mostly :-)).