I wouldn't call the rack mountable Mac Pro a server in the contemporary interpretation. It's rack mountable because video production studios use industry standard 19" racks just like they did 25 years ago when those were populated by Tektronix waveform monitors, vectorscopes and Abekas DDRs.
This is one of the atrocious design failures of the cMP. What was rattling around in Sir Jony's head didn't match up with real world needs.
Like Madhatter32 said Fidelity ATP is an absolute dog on macOS. The technical explanation of its current macOS state is irrelevant to the Fidelity end user. Like I said, my ghetto $170 Wintel PC runs it at least as well as my better appointed Mac mini 2018. If I buy a $1700 Apple Silicon Mac mini and ATP runs the same way, it's still an abject failure regardless of the tech behind it. Some technologists can't see the forest for the trees.
Hell, I have a Sonnet eGFX Breakaway Box 550 with a Sapphire Pulse Radeon RX 580. That's another $450 in hardware that doesn't really give me that much more performance to my Mac mini 2018 for running Fidelity ATP.
That's like $2100-2200 in Mac hardware whereas my weakling $740 Acer Swift 3 notebook can run Fidelity ATP like a champ.
I don't really need to know the technical aspects of Fidelity ATP runtime execution. I can just look at my computer hardware expenditures and know that I need to spend 8-10x more on Intel Mac hardware than Wintel PC hardware for the same general user experience with ATP.
Hell, I'd be far more impressed if I could run Fidelity ATP on my $99 Canakit Raspberry Pi 4 than whatever upcoming Apple Silicon Mac. Or run ATP on a $300 iPad and project the display to whatever video device handy (like my geriatric 1080p Toshiba TV).
That's the conclusion I came to. I'm working on resolving the issues with the macOS applications that I use and getting them to run on Windows. In one case it's fixing a Firefox bug; in another, it's writing code to use the same keystroke combination to save region as file for macOS. My issues are cost and thermals and Apple is just awful in those two areas. But they beat the crap out of Windows in UI. I want the UI but can't justify it. So my 2008 Dell Studio XPS is my main system now.