macOS Catalina is required for Mac Pro, but I have learned to deal with its vexations.
So I returned it.
The reason is pretty simple, coming after nearly a month of usage which informs my conclusion: over the next 3-4 years, the benefits of a 28 CPU cores and a AMD Radeon Pro Vega II video card will be more than worth the extra cost in time saved and increased productivity, faster software development, etc.
I scrimped and saved all of 2019 knowing I might decide on this large purchase, and along with a 100% federal tax write-off as a business tax deduction, the numbers and expected lifetime and actual benefits all add up.
Accordingly, the Apple 2019 Mac Pro 28-core CPU with AMD Radeon Pro Vega II GPU shows up two days from now on Friday, whereupon the 16-core goes back (order to delivery was only ~7 days in spite of the “2-4 weeks” notation at B&H Photo). The model is shown below.
Naturally I bought the Mac pro with only 32GB memory, since the 384GB of OWC memory is going into it, along with two OWC Accelsior 4M2 PCIe SSDs. (for sale $219: 32GB of Apple memory as 4 X 32GB).
Below, I use five OWC Thunderbay 4 units for most of my storage, though I also have one OWC Thunderbay 6 unit (6 bays instead of 4), and OWC has an 8-bay OWC Thunderbay 8 coming. Nearly all of the capacity is for backups as I am moving to a 100% SSD main storage approach.
Below, I am currently using the LG 27MD5KB-B 27" UltraFine 16:9 5K IPS Monitor shown below along with my trusty NEC PA302W. The LG 5K is excellent and a BIG practical plus is that it breaks out 3 high-speed USB-C ports, which solves a thorny problem off too few USB ports on the Mac Pro.
My desired display setup includes the Apple Pro Display XDR and most likely the NEC PA311D, but that’s a financial bridge too far just yet. The NEC PA302W remains critical to my work however, for its low pixel density; see Too-High Pixel Density on 5K and 8K Displays Impedes Image Assessment.