I'm interested in this as well. I rarely see macbooks on tour anymore - apart from simple QLab setups in theaters. In the scenarios I hear about them, it is usually problematic (dongles not working, overheating etc). We still have 2015 models running QLab/Keynote, and haven't had any compelling reasons hardware-wise to upgrade them apart from wear & tear/physical damage. USB-C has been a huge hit to reliability on the road. Going forward, we're limiting the builds to rackmount mac minis for QLab/Keynote, and Resolume/MadMapper will be running on PCs instead.
The new Mac Pros are also too little too late, and at a price point where they compete with dedicated media servers/solutions - I'm not certain they bring anything to the table. It does have the rackmount capabilities, but otoh you can build a rackmount crazy dual GPU powerhouse for the MP entry level price (which has 4GHz 8c/16t rx580/32G ram). My current home computer is better specced than that for half the price. Including a monitor. With a stand.
And to clarify, I'm not a disgruntled Apple customer - I just don't see the financial sense or prevalence in Apple equipment for this line of work any more.