We (SharpTools) have been working with the SmartThings team to transition to the next gen APIs. 
The SmartThings community is stuck between Groovy and the next gen platform with stuff spread across both. I’m hopeful that once the new Edge Drivers go live (production) that we’ll see some progress forward. There’s a contingent of community members hanging on to custom Groovy DTHs as there hasn’t really been an alternative up until the Edge Drivers announcement a few weeks ago. It probably sounds scary to the contingent of SmartThings power users with lots of custom DTHs, but getting to the point where the bandaid can get ripped off will help the rest of the platform move forward.