In the Windows world 'pro' laptops are normally defined as those equipped with Xeon processors and Quadro graphics cards. They also must have passed at least 8 (and often up to 15) military specifications re: resistance to shock, dust, water, drops, temperature extremes etc. HP mobile workstations also have upgraded capacitors and pc tracings to ensure longevity. Mobile workstations are also certified by software vendors to run certain software packages optimally. Finally, 'pro' workstations come with 3-year onsite business support as standard. By these definitions, the MacBook Pro is a consumer machine, but a good machine anyway, or at least it used to be.
What you describe is a workstation laptop. The macbookpro has never in its existence pretended to be a workstation and I have no idea why you are comparing them.
Regarding the definition of 'pro' laptops and what they should be is down to pure marketing. I know plenty of professional people using these laptops to earn money, so they are 'pro'. But they are certainly not workstations, which are for a specific and very small section of the population [I am one of them].
I will say my usual argument that Apple is a consumer company who makes higher end computers. They are not in the business to compete with HP / Lenovo / Dell on workstation PC's. Why would they, it is a tiny market of a tiny market, in comparison to the tablet / phone / services business.
You guys really need to understand what Apple is as a business. They do not focus at all on workstation level computers. Look at the imac pro [which I have] - they couldnt even be bothered to give it a new case. And the mac pro - waited ages for this. They are the lowest of low priorities as they will barely sell none of these.
Whereas a reasonably specced thin laptop that looks great will sell plenty. Just because it is called 'pro' due to the marketing team doesnt mean it is a workstation, or should have replaceable parts etc.