We’re talking about removing support for PCIe expansion and depending on Apple Silicon. The whole transition to AS isn’t even complete yet. So, yes, fledgeling.

They have no discrete GPU, only SoC implementation.

Their ANE (APU) is the same and you need to convert into Core ML format.

Edit: I do not think they will actually drop support for PCIe because ARM-based SoCs can already implement PCIe.

But how support will look for existing devices is up to Apple and the vendors.

Putting expandability back into the pro was one of the major returns to form (as well as rack-mount), so I don’t see them going anywhere.