To summarize my original explanation above:
- State derived groups, used to propagate commands to group members, can only be modeled as single endpoint (e.g.
PowerController.powerState
) - Standard “functional” groups, used to define a group of functionalities, can only be modeled as group endpoint (e.g.
Endpoint.Light
)
Hopefully, this is clear enough.
As far as new method, nothing has changed in how to configure your items for Alexa in OH3. If your concern is about the WebUI Alexa integration, you can always use the item file definition or the code tab as an alternative. Nobody is forcing you to use the new UI or at least to migrate all your existing items at the same time. You can take your time so you can get more familiar with the new functionalities added in OH3.
Keep in mind, there is a major metadata syntax update for the Alexa skill coming down the pipes including a rework of the current WebUI integration.