I beg to differ ... the future is doing more with less - in this regard, I feel satisfied because I'm not doing less with my Mini vs my old setup - I'm doing more. That 600hp Bentley (MacPro) doesn't phase me because I have no roads suitable to drive on.
Without wading into the whole Pro vs PRO debate, not knowing your situation, I am
guessing that the 2014 Mac mini would not have had enough horsepower for you to do your Pro work. It would not have for mine, while the Late 2014 27" Retina 5K iMac may have been enough horsepower and the 2013 Mac Pro enough horsepower and then some depending on the configuration.
My point being that the 2014 mini had almost zero overlap with the 2014 5K iMac and the 2013 Mac Pro, while the 2014 5K iMac and 2013 Mac Pro had overlap to a point, at least in benchmarks, and until you moved to the 8- or 12-core, you might not have felt left out of the party doing work on the iMac versus the MacPro? Sorry to make it complicated.
With the introduction of the 2018 Mac mini, all three tiers have enough horsepower to be faster than the 2017 27" iMac and overlap heavily with the 2019 27" iMac, at least until you hit the Core i9. In fact, all of the CPUs used in the 2018 Mac mini are also in the 2019 iMac by default or as a BTO option (i7-8700/B), which was something that had been sorely lacking for the past 4 years after the 2012 was replaced.
Plenty of people have viable 5,1 Mac Pros that will last a few more years, but certain PRO workflows have had massive increases in the requirements, so that a 1080p/30 8-bit workflow that was possible on an older Mac Pro 5,1 has been replaced with a 4K/60 10-bit HDR workflow that brings some modern computers to their knees and puts a stake through the old 5,1.
With the Mac Pro 5,1 and 6,1 now being outclassed by the Mac mini, the bar for entry ($$$) into a lot of Pro workflows was lowered the day Apple introduced the 2018 mini.
What I am trying to "argue", for lack of a better term, is that certain specific workflows that are either in their infancy (4K HDR) or have yet to really even start in earnest (8K) were Apple's primary targets with the 2019 Mac Pro did not exist in 2009-2012 (Golden Age of the Mac Pro) or even in 2013 (that thing everyone seems to hate) and that had they been at that time, the Mac Pros of the day (2009-2013) would have been woefully inadequate. Instead, 1080p/30p or 60p content ruled the day and was a fairly well-established workflow by then. When Apple decided to build the 2019 Mac Pro, I think they started at the high end (28c, 24c and maybe 16c) as their baseline and actually worked backwards to increase the number of Pro who could take advantage of the new Mac Pro as the original spec started at $20K and went up from there. And so, to reach as many people as they could, they pared back the configuration until they arrived at a price they thought would be palatable considering they missed about 3 generations of updates to the 2013 Mac Pro and all the consequent chances to raise the prices gradually to that level. Six years with an upgrade every two years of CPU/DRAM/GPU/SSD and they could have bumped it up in 2015 to a $4000 minimum, 2017 could have moved it to PCIe 3.0 and TB3, I think (have to double-check) and $5K base, which would have matched the iMac Pro) and finally this year, a new chassis, new CPUs, new MPX, et al and a rise in price to $6K.
Anyways, I think Apple's answer for their lack of attention to the Mac Pro since 2013 has been to increase the capabilities of the iMac and iMac Pro at the higher end and then they shored up the bottom end with a truly capable 2018 Mac mini. Now, they have returned to the higher end past the iMac Pro and to be at the cutting edge of certain specific workflows to appeal to their most eager potential customers. Just my 2¢.