Apple admitted they made a design mistake with the Mac Pro. It’s clear that they were originally planning to abandon the Mac Pro and release the iMac Pro to address the high end - along with operating system changes so Macs would work better with external GPUs.

Then they had an about face mid last year.

What I don’t understand is how hard is it for them to make a simple pro Mac in a tower case? I doubt that it takes PC manufacturers two years to design a mid tower high end workstation. Intel is doing most of the engineering and they (Apple) already have a very high performing SSD controller.