On both sites, I've found, the broader and more simple your idea, the more responses you get.
There was a member named Headfonz who would run threads with titles like ( I'm just making up an example ) "Not Sure" and the OP might be "Sometimes I'm sure and sometimes I'm not. Do you know what I mean?" This would be the entire OP. Folks might chuckle about the simplicity of it, but they would often quickly get to applying this template to their specific situation, and so First Thread Poster ( FTP ) might say "Yeah, I'm not sure about X right now", and STP might comment on their soap opera in a similar way and say "I'm not sure about Y because of so and so. But things used to be more clear cut because of yadda yadda". Later posters could continue this, or make remarks about FTP or STP etc. it would end up being a fairly lively thread.
But if you purposely eliminate a lot of the more obvious responses to what you're posting, by second-guessing them and ruling them out from the start, you are hoping for a thread which is the opposite of the one I just gave examples of.
I'm often trying to do this latter kind of approach. Getting responses of any kind is ....something, so that one doesn't feel the "vacuum" as was stated; but getting sophisticated response is what I really want. And I know there are people at both sites quite capable of giving it. ( Not that I haven't run some silly threads for fun, or engaged in banter etc. - and me saying this is an example of ruling out a response I'm not interested in. )