I don't see retention as much of a problem at the moment. Yes, some good people will be lost maybe never to return however, that will be a small fraction of the eventual total hopefully. The platform isn't ready for average users (those who just want to signup and begin) as there are UI and UX hurdles. It is much too complicated for most users. When this changes, retention won't be much of an issue. Currently, we are using a sieve and wondering why it doesn't hold water. Perhaps these hurdles are a good thing at tbis point as those who stay and invest time and effort might be the types to build the community, not just live off it.

Edit: for example, I wish settings were applied and remembered across devices...