Ring, Lutron, Hue, and a couple of other integrations are in a weird kind of limbo state. The original integrations were done by smartthings staff For the classic app or even the app version before that.
Under the current paradigm, integrations are supposed to be done by the device manufacturer. But not all of these manufacturers have a agreed to take over integrations that they never wrote in the first place and may not have staff trained to do.
This leads us to situations like the 2019 Lutron fan switch. Lutron support says it’s up to smartthings to make it work with the integration, smartthings support says it’s up to Lutron, and it looks like no one is working on it. 
Arlo, which was originally in this group, has stepped up and assigned their own resources and rewritten the integration to work with the new platform. Which looks like it’s going to pull in many more models than the original integration, so that’s good.
But it’s all being done on a company by company basis, and so far, at least publicly, ring has not gotten involved.