The reason motorcycle companies invest in racing is not just to establish cred, but to actually push the boundaries of technology and innovation that they can then incorporate into their "consumer" models. A "true Pro grade" computer offers no such advantage - in fact most of the innovation comes from making things smaller and thinner - as soon as you take away the weight/size restriction, sure you can make supercomp…
Except that it's not easy to put supercomputer-level performance in a lightweight box (with decent battery life) that you can slip into your bag.
If Apple really wanted to push the boundaries in that way - getting great performance while still using an impossibly small laptop - there's actually a few directions they could've gone in, namely anything where you push computation into the cloud and then see the results locally. Basically come to market saying "you Windows/Linux schmucks and your tons of local VM's. You don't need that, we'll run your VM's in the cloud, and we'll make it Apple-easy for you to do so." No more local rendering, local building, nothing. The original assets are kept on some Apple cloud, a cache is kept on your machine, and whenever you start an operation, it starts the operation both on the cache and on the Apple cloud, and if the Apple cloud finishes first, then the results are returned to your computer.
Unfortunately, Apple just doesn't care anymore about its professional customers. It started with the EOL for XServe (which could've been transitioned, along with OS X Server, into a private-cloud oriented offering) and it has worked its way down into its end-user offerings.