Please define "high end professional use"?
Apple should just drop the word 'Pro' - it's making the Mac professional elitists think this notebook is designed for them. This is a mass market notebook for those that can afford it. It's a relatively powerful notebook. Nothing more.
Pro stands for their pro line of notebook, i.e. better than a Macbook.
Pro does not stand for 'OMG THIS NOTEBOOK IS FOR HIGH END PROFESSIONALS, ONLY CGI GRAPHIC DESIGNERS FOR HOLLYWOOD BLOCKBUSTERS AND QUANTUM SCIENTISTS TRYING TO COMMUNICATE WITH ALIENS THAT NEEDS 17 GAZILLION TERAFLOPS OF COMPUTING POWER'
Seriously, get over yourselves.
Most of your post is complete rubbish... iOS/macOS hybrid? really? how so? you mean the absolutely beautiful integration between the two platforms? Apple has already said they are not abandoning macOS, their desktop or their notebooks.
High-end professional usage are those tasks most demanding upon the system. In example, 4k video editing and beyond, VR, the upper limits of Photoshop and essentially all production environments for these uses and others.
Where some confusion may lie is that obviously not all professional applications are as demanding; if otherwise satisfied with the keyboard and form factor a professional writer could be perfectly satisfied with no more than a MacBook.
By implication a MacBook Pro ought to be something more, better at meeting other tasks. To an extent the 2016 MBP does and by some measures a more capable computer than its predecessors. However it can be fairly argued that with this iteration, and really beginning in 2012 with the rMBP, that Apple chose to aim its top-of-the-line laptop principally at the broad consumer market. In truth they could always have done more, these computers more powerful, yet now most pretense is cast aside.
Desktops are obviously best optimized for heavy tasks. Yet for various reasons laptops are preferred instead. But by the very comparison it is readily apparent the necessary compromises made to allow a small mobile form factor, or that at least in power, etc. they must remain inferior.
Thus the question to what extent. If Apple has by some measures broadly met the majority of needs, and some professional, with the 2016 MBP, certainly not in what this laptop could and arguably
should have been. Not if accommodating the high-end.
Final Cut Pro is optimized for OSX. Thus a 2016 MBP running it can outperform a Windows platform with better specs. But that is where the advantage largely ends. OSX optimization with Apple hardware provides an edge in some circumstances, yet with other software the difference is decided by physics and overall specs.
Such as RAM. Video editing can be done with 8GB of RAM; 32GB of RAM would be more the preferred minimum if doing online editing, versus offline. If that largely an academic argument as online editing requires significantly more CPU power than a MBP has.
Not to mention the common desire and need of certain professionals to upgrade their equipment. Or to what extent any MBP since 2012 meets this need, particularly the appliance of the 2016 MBP with most everything glued in place?
Demanding tasks are those such as rendering or the use of filters in Photoshop. Raw horsepower is required and the ideal is for any such task to take place instantly. Again, desktops are best optimized for such, but the question remains to what degree a supposedly high-end laptop should match same.
All this said, it is rather like putting the cart before the horse. The principle question lies in the future of all Macintosh.
Despite some questionable limitations the 2016 MBP would likely not be suffering as much opprobrium if the state of the Macintosh was otherwise healthy. It is not. There is the rub. In laptops the 2016 MBP is supposedly the epitome of that professional, when clearly as the top-of-line model it could be more. This in light of alternatives within OSX which consist principally of the most powerful iMac. The Mac Pro should be it but is three years out of date, not to mention badly configured at the outset with the 2013 redesign. Moreover there is a distinct possibility both it and the Mac Mini will be discontinued.
Then the question of the software. Final Cut Pro is a solid professional application, despite some contention in changes Apple made and its possible future direction. But almost an anomaly as Apple has been systematically either eliminating top-tier software like Aperature, or dumbing it down, witness the direction of iPhoto.
The intent seems to be to better meet the limitations of iOS and integrate OSX with it. That is already in progress. The 2016 MBP is an example both in its hardware and software integration. While there is nothing wrong with such integration per se, with many advantages widespread, the problem is that Apple has chosen to lower the standards of OSX rather than raise those of iOS.
In a world of iPhones and iPads this can be somewhat overlooked. The 2016 MBP will better integrate with them, and increasingly will in time. For common purposes this is mostly for the better. But it does nothing to raise the bar for what iOS might better be, save perhaps when it is forced to due the market forces of competitors. All the while negatively impacting OSX and particularly all high-end tasks it could otherwise be used for.
In short, with the Macintosh Apple is whittling down the software and hardware to a lower and lower common denominator. It should be more than it is today, and could be far more in future if they so chose. Given their current direction that will not happen. To the extent the Macintosh name is retained it will be more an appellation denoting iOS products in a legacy format.
That is why the 2016 MBP matters as much, it is not only one of the forerunners but the most public pronouncement Apple has made of its intended direction. This with distinct and growing limits on the upper levels of computing done for personal and business purposes.
For those so interested, reference here to three relevant articles concerning the demands of 4k video editing, etc. The first provides a good overview:
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https://www.cinema5d.com/is-the-new-macbook-pro-2016-fast-enough-for-4k-video-editing/
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http://terrywhite.com/photographers-imac-retina-5k-vs-mac-pro/
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https://www.videomaker.com/article/f6/17135-editing-in-4k-minimum-system-requirements