I know there's a lot of discussion going on regarding the price and I don't want to debate that here, but rather regarding who exactly is this Mac Pro intended to be for?
I believe it is for video production teams for whom the cost of the hardware (computer and cameras) are one of the smallest line items on the final bill to bring their production to market. Even if they spent $45,000 for a maxed-out Mac Pro and monitor, they'll get many years out of it. Same with the tens of thousands they spent on their cameras and audio equipment.
What they spent on each shoot in terms of crew transportation and housing costs to more exotic locales could easily run into the tens or even scores of thousands of dollars. So in comparison, the hardware is a "bargain" due to it's useful life.
I am sure there are "wedding photographers" and "YouTubers" who can swing a Mac Pro and they might buy it for bragging rights or because they've made the financial calculation and the workflow performance improvement is such that the machine's cost pays for itself quickly enough to financially justify the investment. But such a machine has a much bigger impact on their bottom line in the Purchase Year than it does for whom I believe is it's target market.
Back in the day, the power mac (pre-intel) and even the early Mac Pros were sold to consumers, hobbyists, prosumers and full professionals.
Rightly or wrongly, Apple now sees the iMac, iMac Pro and MacBook Pro as the "right" computer for those people. They no longer see the Mac Pro as the "catch-all tower" it was back in 2006 and the PowerMac days.
As time went on, it seems apple was pushing the Mac Pro to the more higher end users even the trash can Mac Pro was targeted to more of the professional, but what professional?
I believe the 2013 Mac Pro was still a "prosumer" machine, if no longer and "enthusiast / hobbyist" machine due to it's lack of external expandability and replaceability.
As I ramble on, I guess one thought regarding the Mac Pro, did apple make a mistake in targeting the ultra highend with this model, and sales will be fewer then if they designed a desktop/tower computer that could fit the needs of prosumers, and/or hobbyists.
I fully expect that a fair bit of the cost of the new Mac Pro is the design and the components to allow it to scale as high as it does. The most-powerfully scaleable workstations from other Tier One (HP, Dell, Lenovo) vendors start at prices within a $500 to $1000 of the Mac Pro.
Of course, those vendors also offer lower-tier towers that cannot scale to anything near what the Mac Pro does (and to be fair, those vendors 'Mac Pro-level' models can scale well beyond what the Mac Pro can), which is what much of the distress about the 2019 Mac Pro is focused on. A machine that can only support 6-8 cores instead of 16-28 and gigabytes of RAM instead of terrabytes. Can accept one gaming or workstation card instead of two. A single SSD instead of two in a high-performance RAID configuration.
There is also complaints about the base level equipment, but to be honest, even if it was a 10-core CPU, 64GB of RAM, a 1TB SSD and a Vega Workstation card for $5999, it would still cost too much. It would just be ludicrously expensive instead of insultingly so.