I really think they decided the desktop is dead. They're assuming developers are using MBPs.
Things like visual design, print design, and UX are not very heavy tasks and could all be done without even a dGPU... but the entertainment industry, as far as I know it, has been Mac heavy in the past. Maybe I'm wrong though.
Remote render farms are becoming more affordable, however.
The middle ground user is probably far more profitable and less of a headache for them.