I think redheeler is spot on.
Apple has tackled the pro/prosumer/hobbyist market with a myriad of products that were not possible back 10 years ago.
1) who could imagine the performance from the new 2019 MBPs with 8 cores and tflops under the hood ? With the optional eGPU upgrades one can extend the life of this machines or make a perfect desktop power/mobility combo
2) the latest mac mini is not perfect but it’s plenty powerful. One can complain that’s not an upgradeable device but for a 3-4 year run there’s plenty bang for the buck. And hey, you fan add your current monitor setup or change monitors as time goes buy
3) iMACs have become top of the line performers as well. The cooling is not the best and GPU options could be better but no one can argue that these are gorgeous monitors (thinking of that 5k beauty) and are a great package deal. And memory is upgradeable
4) iMAC PRO are the de facto prosumer device: great looks and amazing performance (improving the cooling solution was part of the magic).
If one takes in to account the fact that Intel CPUs are no longer evolving in leaps and bounds but rather trickle down gains (except for ultra portable formats), the iMACs can be great 4-5 year workhorses for most needs.
So yes, I agree that Apple designed the new MAC PRO exclusively for the top tier professional market. IMO they smartly targeted the only segment that their other machines were not a good fit. So kudos for Apple
Let us know when the Mini, iMac, or iMac pro can handle sustained loads.