SE should keep the beta forum open... forever!

The point is to provide useful feedback to the developers. Whining incessantly and constant doomsaying are just as useless as rampant whiteknighting and pretending everything is puppies and candy when it comes to providing feedback.

Nothing improves absent criticism. There'd be no reason for it to.

I'd say that the lack of it on the lodestone forums probably has more to do with not having a game to criticize right now. Wait until the NDA lifts or phase 4 starts and it'll start rolling in.