I've seen a few complaints about this recently, and it got me curious as to what people think a thread should be. I've always been of the opinion that threads will naturally flow around the topic, while also talking about related ones. It has recently become clear to me that some people create threads with very specific intentions, though. So:
Should a thread be allowed to move and flow wherever it may?
Or
Should a thread stick very closely to the intentions of the original poster?
Or
Something else (please explain).