I’m disappointed they chose “pretty” over a “functional” metal box like the old Mac Pros. They ran into thermal issues with the fancy design of the trash can, despite their promises of cutting edge thermal design. These iMac Pros are probably going to be soldered-CPU, soldered-RAM beasts with low repairability.
It's a bit of a small victory that they support external GPUs, but I think they are missing the boat here.