You realize he said "software" not "UI", right? That encompasses the whole experience. Not just the UI of the most recent watches.
I believe the 735 adopts the UI the 235 has had. It's pretty usable, but rather a pain in the azz to get to some stuff. Need to set or change an alarm on a 235? Press Up and hold, then Down, Enter, Down, Enter, Down as needed to get to whichever alarm or to Add New, then Enter+Enter to turn it on or off, or Down+Enter to change the time, using Up/Down on hour, Enter, Up/Down on Minutes, Enter, Up/Down on AM vs PM, Enter, then Enter to confirm (checkmark). Follow with Back, Back, Back, Back to return to the watch face.
Yep. Great UI.
Feel free to like Garmin all you want. Their top end watches do get the job done for sports, though you have to ignore various annoyances and bugs. Just don't claim the UI is anything more than "less bad" than prior watches.
Oh look, my 235's lost it's connection and I need to restart the garmin connect app on my phone for the third time today.
Im not saying it's a great UI. The point is it just works for sports once you know how to navigate the clunky UI.
Have you tried UP UP Down Down Left Right BA start?