Someone tried PCIe on the Raspberry Pi 4 already. Yes, the wiring job is horrible, and yes, of course it works, as I've said many times. Go hack on PCIe already, it's easier than you think. Now someone needs to stick a Radeon RX Vega on there, for kicks. http://mloduchowski.com/en/blog/raspberry-pi-4-b-pci-express/ …
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I'm surprised it works at all with this wire mess. PCIe in Atomic Pi is so fragile, that it won't work if you sneeze too loudhttps://ripitapart.com/2019/06/25/atomic-pi-adventures-episode-1-adding-external-pci-express-expansion-by-removing-onboard-ethernet/ …
I feel like all those headaches had more to do with the author trying to keep the original chip on first (bad idea, even tristated) and using the wrong caps, than with PCIe being picky about short sections of messy wiring.