Some SmartThings staff ( and maybe one of the public announcements?) have said that SmartThings’ Matter implementation, at least for local integration, is going to be via edge drivers that are specific to Matter.
found it: see the first post in the following thread:
Starting on Tuesday, April 26, new devices onboarded to the SmartThings platform will begin to be backed by Edge (Lua-based) drivers. Note, this transition marks the start of a gradual process that will initially include a small number of devices but will expand to cover more over the coming months. This is an exciting announcement, which will be followed up by many more in the upcoming months as we complete the transition away from Groovy DTHs.
In addition to support for existing hub-connected device protocols (e.g., Zigbee, Z-Wave, LAN), SmartThings Edge will also enable Matter devices to be introduced to the ecosystem as soon as the Matter standard is finalized later this year. The immediate benefit of the shift from cloud-dependent to local control means users of Zigbee, Z-Wave, and L…