All the following is based on my experiences and observing the posts to the forum of failing users.
The hypotheses I have drawn have no other support.
I think that there is a major problem around knowledge and perceived knowledge in the MB project.
Those heavily involved in the project are very knowledgable.
But they can not conceive the level of ignorance that many people bring when attepmpting to use Picard and add to MB.
"Herding cats" is about right.
By "general release" I mean "accessible to the top 7 deciles of IT skill levels of internet users wishing to use or contribute".
I estimate that the current UI and skill set required makes Picard and MB accessible to the top 1 or 2 deciles.
The inaccessibilty to an estimatef 50% of internet users who have rough average or better IT skills is what I point at with "not ready for general release".
It could be that music tagging and metadatabase construction are essentially too complex for 80-90% of Internet users. Or are seen as such by MB.
In either case a statement warning new users of this would be a responsible approach. Leaving people to fail is not generally a pathway to repect or success.
And maybe I am wrong.
Right or wrong, either way; a major project that is not seeking to gather data on what I address is not orientated towards being accessible to the general population of internet users.