Searched the entire web for any technical differences between PCIe and DMI, nobody really has an answer except to make it proprietary.
[Intel DMI in mask]
"Alright, let's see who you really are! *remove mask*"
[PCI Express?!] #electronics
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Something about dmi limitations
https://www.overclock.net/threads/will-dmi-2-0-limit-the-platform-life-of-x99-based-hedt-cpus.1614274/
Relevant stuff on Dmi/Pch/Pci
https://en.m.wikipedia.org/wiki/Platform_Controller_Hub
@lucifargundam But this is not unique to DMI, everything would still be true if you s/DMI/PCIe/. PCIe has exactly the same limitations.
On Intel we have the CPU + PCH combination with a proprietary DMI interconnect, but on ARM or even AMD platforms, the equivalent would simply be a standard PCIe interface on the CPU followed by a industry-standard PCIe packet switch.
The DMI spec, as everyone suspects, is basically 90% identical to PCIe of the same generation. The question is where the 10% difference lies. But as the very purpose of DMI is making it proprietary, a clear answer is unlikely.