My guess is that they may have some ambitious plans, the autonomous car for one, which is admirably forward thinking, but it fell short and pretty much relegated into just a system last time we heard. They probably have been trying some grander transformation, which gave enough reasons to cut out the older fat like pulling out of display business, but did so prematurely. Somewhere down the line it may have occurred to them that even the public like us has got wind of how stuck they are and they needed a response.
Could be, but I think they may just as well have pointed out towards the iMac Pro and potentially the 32GB MBP as an assurance - ‘look , we care about you “creators”
Reg Project Titan, yes it may have hit a wall and then there is the possible pushback from other, well entrenched car manufacturers, with superior recall value in that segment, which might have caused Apple to pause and ponder. Apple’s main rivals in its current sphere of influence are essentially software makers ( Android, Windows, media streaming services) and while HomePod may or may not gain traction, I can see where it might function as the alternative to the Airport with additional features on top and there too it has serious competition in the form of google’s home and Amazon’s echo but it has nothing to do with the existence of a Mac Pro.
Nothing in Apple’s recent initiatives suggest a Mac Pro has to have a place in its lineup and I suspect technology will already shrink the form factors without sacrificing power ( in areas that macs operate ) in its current lineup, so it has even lesser incentive to make one.
The window to come up with an answer already seems to have passed ( a revamped Mac Pro in 2016 might have been better received and kept the migrators in the eco system and by now we would have a viable eco system nurtured by a Mac Pro ) but it is something Apple was already aware and perhaps didn’t care. It has already tried to woo back the Mac Pro segment with the iMac pro. It remains to be seen how well it does and Apple might have delayed the Mac Pro enough to give an iMac pro a substantial lead to cannibalize its Mac Pro users.
Even with a nMP, what will Apple bring in terms of innovation ( considering it already burnt it fingers once with the tcMP) except its ‘oooo shhiiny’ potential ? It will be mostly dealing with regular hardware anyway so performance isn’t a viable metric when compared to the rest of the PC industry.
P.S. I think Apple is looking for its Next big hit before fading out of the pc industry as a serious player. We are already looking at rumblings of a post smartphone era. Smartphones may act as a hub for future consumer/business technologies but it likely won’t be the final client interface as it is now.
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If Apple want to sell more hardware, they should buy Adobe and immediately stop selling their windows versions.
That will open a real sh*t storm for Apple.

..Not happening.
Adobe will lose a gargantuan market share on the PC side of things. What would be the point ? Apple buying out Adobe is essentially killing Adobe as we know it without any benefit to itself.
Would have been a viable strategy 10 years ago when Apple was still visibly competing in the x86/traditional computer space.