Apple's biggest issues IMHO....
1.) Assuming pro users would buy a souped-up Macbook Air with no ability to upgrade RAM or storage.
2.) Assuming pro users will only want pen and touch support in a locked-down consumer appliance that's not suited for content creation. We want a Macbook tablet/2-in-1.... preferably with SO-DIMM slots and replaceable SSD. The iOS and Mac teams should not worry about "competing" with each other.
3.) Assuming pro users are OK with dated CPU and weaker GPU's compared to cheaper Winblows machines.
I'm actually OK with USB-C and needing dongles in the short-term (though I want magsafe back). I just want a modern capable machine that can be upgraded and the ability to use pen and touch. And for them trying to slowly lock people into the Mac App Store.