Updated to 23.10. Those multitude of interface options are still there. But it connects as an MTP device always and shows up in both BaseCamp and Garmin Express. Express gets a little confused about what maps are installed after an update and has trouble reconnecting. You have to unplug and reconnect to get it sorted. I'll definitely check My New Garmin because this unit seems to have quite a few differences between it and the previous 7xx series.
Oh yes, syncing with Garmin Explore on my phone is still goofy. I'm not sure of the maximum track name length in Basecamp, but you are limited to 36 characters on the Montana. If this syncs to Explore, they are truncated to 31 characters in Explore. If you add back the missing 5 characters in Explore and sync again, either they sync back with 36 characters so the Montana matches Explore, or nothing happens; I can't tell which. In any case the names end up as 36 characters in both places and seem to stay that way after every sync. I'm not even going to go into the Explore Web interface which is a hot mess. I just wish it was consistent as to the lengths of track and waypoint names when syncing both ways.
