The Collections DP page states that only a subset of functionality is available (which is correct) but it does not list the limitations. These limitations should be clearly listed.
The Docs page in question: https://docs.couchbase.com/server/6.5/developer-preview/collections/collections-overview.html
The following are the limitations:
- DP is for Key-Value access only.
- RBAC will be available later.
- Collections should be created in a new bucket only after turning on the DP switch.
- The integration of collections with XDCR, Indexing and N1QL, Eventing, Analytics and Mobile will preview later.