Yea, and I suppose it adds some complexity as new features have to be usable by storage engines. I can't remember what the JIRA ticket was about, but I've seen

Yea, and I suppose it adds some complexity as new features have to be usable by storage engines. I can't remember what the JIRA ticket was about, but I've seen that there are some edge cases that have to be considered for the pluggable store API.