defjam:
What in your opinion constitutes Apple's demonstrated commitment to the Mac Pro ?
I offer you some history, that IMO does show Apple's commitment to the Mac Pro model.
The first Mac Pro was launched in Aug 6, 2006; known as the Power Mac G5. This model followed the 2003's PowerPC-based Power Mac G5. Even the Apple's Power Macintosh hails back to 1994 and continued until 2006 when the first Mac Pro was introduced. The Mac Pro then continued to be offered in various forms up to today late 2019. That is a span of some 25 years. Granted, there have been periods between the different model launches the last being very long; 2013 to now late 2019 or some 6 years. I think this last 6 year period caused many people to not be convinced Apple was committed to the Mac Pro line of computers, and for good reason due to the lapse of time without Apple revealing what they were doing. However, after Apple admitted in 2017 that the Cylinder Mac Pro launched late 2013 was not able to keep up with the technologies, it did promise it would totally redesign the Mac Pro to deal with this issue. In April 2018 Apple did confirm it was indeed working on a redesigned Mac Pro to be released in 2019. We now have the new 2019 Mac Pro some two and half years after Apple made the promise in 2017. This new Mac Pro is offered as a stand-alone tower design and a rack mounted version, an d is built in China but assembled in USA/Austin TX, and was visited by Trump in Nov 2019 (see attached photo Op). The iFixit gives this new 2019 Mac Pro a repair score of 9/10.
IMO the stretch of time from 1994 to 2019 (25 yrs) with Apple supporting the Mac Pro constitutes its commitment to the Mac Pro line of computers.
Could have Apple moved faster for releasing newer Mac Pro models... possibly, and due to Apple's secretiveness about its R&D this has hindered and promoted people like yourself to think Apple was not committed to the high-end Mac Pro line of computers.
The Mac Pro does not sell in the millions as does Apple's other products such as the iPhone, but IMO the Mac Pro serves Apple as being a 'halo' product if nothing else. 'Halo' products, such as the Volvo R auto design, are a means to promote a companies other product lines and can help them secure a loyal customer base. The 'halo' product may not be a 'money maker' for a company, but it has or can have enormous impacts on customers loyalty and commitment to their products.
I do agree that Apple's secretiveness over it's R&D wrt the Mac Pro does give rise to peoples' view like you've expressed. It's an outcome of companies (and countries for that matter) wanting to be competitive with the fast moving technology advances.
Cheers....