I just didn't like the action on the Axiom keyboards. It is interesting how subjective keyboard action is. For instance, I don't like fully weighted keys. I like light keys like my Triton and X7 have. And, not sure if this matters for other people, but the keys are shorter on the MPK and it really makes playing harder for me. I like longer keys as well (and something I didn't even check in the store). The other thing was the black key shapes. I like them slightly curved a bit on the edges, not that I couldn't learn to live with a different key, but the feel is much nicer to me.
Given I have an MPD32, I have all the advantages of the MPK61 and none of the disadvantages already, so even if I end up not using the Automap stuff at all, as long as the keyboard action is great, I'll be happy. We'll see though, I am certainly not sure what the keyboard will be like. Given that Novation touts the feel of the keyboard as important and they point out the use of the Fatar keyboard, then it might be good. One reviewer I read said the keyboard felt the same as the Triton keyboard, so I hope they are right!
(And it looks like the Triton does use a Fatar keybed
Keys & Contacts | Yamaha, Korg, etc., but cannot find any info on what the Fantom X7 uses).