I think boredom and lack of fulfillment are basically the same, and the biggest drawback at this time.
Regardless of the original intent of Fluther, it’s now a social site and (for the most part) the questions that garner a lot of answers are the social and gaming questions.
People tend to be drawn to Fluther because they think it’s a question and answer site. Often they ask a question and get few responses because they are “unknown” and suspected “spam”. The answers the do receive likely focus more on sytax, spelling, grammar and snark than on the actual question.
Honestly. Fluther is a mess for the new user. They ask or answer a question and see a lot of up-tight editing, in-house bantering and snark rather than answers. I don’t think newbies have a clue what’s going on and just leave.
Mostly the heritage jellies seem to leave because there will be a holiday slowdown or another glitch that brings traffic to a halt and they’re bored shitless.
It’s like trying to carve a niche in a broom-straw with intermittent winds.