Especially hobbies...there's currently a thread where a person does a hobby the temp leader has paused it for the summer. The actual type of hobby makes a difference to the responses. You also get my husband does a hobby every weekend.
Or people don't tell the backstory to an event and expect a view on an incident. Or they have a medical condition, or do a job and 'it will be outing' err more than likely not, but will impact on the answers you get.
Or when pertinent questions are asked but the op doesn't answer those
It just annoys the hell out me as there are times when your opinion will be completely different....for example on gransnet there's a thread about a couple who have recently married and the DH likes to garden in the nude...it would have been helpful if the OP would say if she knew before they got married.