Right now, the Schema integration with ecobee has been “soft launched,” meaning users who newly link (or delete and re-link) the ecobee service to SmartThings will use the Schema version.
The Groovy version still exists and will until a migration occurs and all users are moved from the Groovy version to the Schema version. There is no ETA for this that I’m aware of.
The Schema version and Groovy version both poll for status versus receiving what is called a “callback” from ecobee. The rate at which we poll ecobee is every 6 minutes for either integration option.
If you’re missing events, we’d definitely like to look into that and I’d recommend you contact Support so we can review what’s happening for any issue. Hope this helps explain a bit more, let me know if there’s anything else I can help out with.