Wireless Access

We have two MCs with a MM running 8.5. We currently terminate user traffic on a L3 switch with SVIs. If instead we terminated user VLANs on the MCs, would this negatively impact user mobility between MCs (or have other unintended consequences)?  I assume we would split user subnets in half - one for each MC.  With the UAC (User Anchor Controller) concept, I understand that users tend to stick to a certain MC unless something goes wrong.  I expect we would have to be mindful of firewall rules managing traffic between user subnets, but is there anything else to keep in mind?       

You'd need to consider if the AP fails over to another MC and the client has to re-ip as it is now in a different L3 segment. How would the application on the machine handle this? If the MC are L2 connected, there would not be a requirement for the client to re-ip.

My current impression is that AP failover is independent from client failover; that's how clients can roam between APs on different MCs.  User traffic is tunneled back to the UAC.

Based on this link:

https://community.arubanetworks.com/t5/Controller-Based-WLANs/AAC-vs-UAC/ta-p/292230

Am I mistaken?