I am +1 on classic. This would not work as strict today. I would like to see us investigate whether we can get there once auto-starting support lands, and with interfaces for aptdaemon (dbus) and snapd (snapd-control).
I understand that if the Ubuntu MATE team don’t get this done soon, they’ll miss the deadline and the Boutique will have to be a deb. Classic snaps are an improvement over that deb.