This forum was set up many years ago so that customers could help other customers. It is not an official support channel and there is no guarantee that anyone from Smartthings is reading it. There are some staff members who post here from time to time on their own initiative, but they are not assigned to do so.
The best way to get official attention is to post on the smartthings Facebook page or Twitter feed: those are at least read by marketing staff and may be escalated if they get a lot of attention.
As far as the arrival sensors, it looks like they are being discontinued. At least there have not been any official announcements that Aeotec or anyone else is going to pick them up. And Samsung just informed people who have the newer “tracker“ device that it will be discontinued shortly.
So again, although they haven’t said anything officially, it looks like they are expecting people to use their phones for Geopresence triggers.