Originally, companies sent physical devices to smartthings, and smartthings wrote the code for the integration. That’s how the original ring integration was done.
However, as of 2019, smartthings published their API and it is now the responsibility of the individual device manufacturers to create and maintain their integration, if they choose to do so. Smartthings no longer does that coding.
This leaves some of the legacy integrations like ring and Lutron in limbo, with the device manufacturer saying smartthings has to update it (since it was originally smartthings that wrote the integration code) and smartthings saying that the device manufacturer now has the responsibility for the integration (which is true, because smartthings changed the way they do integrations last year.)
So there isn’t anyone at smartthings who does these integrations anymore. All we as customers can do is keep asking the device manufacturers of the devices that we are interested in to create a SmartThings integration. Some will, some won’t. But the more people who ask, the more likely they are to eventually do it.
This forum was established a number of years ago so that smartthings customers could help other customers. It’s not an official support channel.
If you do want to try to get some official smartthings attention, you can try their Facebook or Twitter. But they are likely to just tell you that it’s up to the device manufacturer now.