Yes, it mostly exists for people who absolutely require PCI slots, except you can’t use AMD/Nvidia GPUs anymore so the utility of that is limited.
Apple has their “Afterburner” card for ProRes media encoding, you could add even more ports, or there’s probably weird AV interface cards, but the vast majority of people can save a few thousand dollars and get a Mac Studio instead.
Since the Mac Studio has more than 10 customers it gets updated more frequently.
There were rumors about the Mac Pro getting a higher tier of “we stuck twice as many cores together in the SoC” but it didn’t pan out, likely not worth the development time compared to the higher volume products. But it could hypothetically still happen.
Apple has their “Afterburner” card for ProRes media encoding, you could add even more ports, or there’s probably weird AV interface cards, but the vast majority of people can save a few thousand dollars and get a Mac Studio instead.
Since the Mac Studio has more than 10 customers it gets updated more frequently.
There were rumors about the Mac Pro getting a higher tier of “we stuck twice as many cores together in the SoC” but it didn’t pan out, likely not worth the development time compared to the higher volume products. But it could hypothetically still happen.