Just putting the watch into DnD mode required flipping through a ring of shortcuts hidden behind a long press menu. My Pebble can do this with a shortcut I assigned to a back-button long-press. Pebble's shallow-menu + shortcuts system is brilliant.
I ponder what Garmin is like in an alternate dimension where _they_ bought Pebble and used their UX chops for their own devices...
On the other side, I think they are a little trapped in their legacy UX. A lot of people have Garmin watches long term, and will probably scream bloody murder if everything changes.
I don't mind so much. I have one of those budget models without a touch screen, and I find the UI vastly easier to use than my prior Casio hiking watches at least...