I do that a lot, the topic is "A" but I bring in a bit of "B" and "C" too. Because I think it's close enough to be discussed but not worth starting another post.
So far I have not had a lot of things removed because of that. Is it because people don't report my posts or because mods think it's still on topic?
I probably wouldn't report that.
Me neither. This happens in all threads as pages advance: conversation "A" is mixed with "B" and "C", which are related. But as we are advancing in the alphabet, the conversation has less to do with the main one, which is "A". That is, conversation "B" is clearly related to "A", "C" is clearly related to "B" but not so much to "A", "D" is related to "C" but has even less to do with "A", which is the main topic of the thread.
The problem that I perceive as arbitrary is when me and naim027 get two replies deleted, let's say they are "C" or "D", and I report two replies that are also clearly "C" or "D" and the reports remain as "unhandled" which makes me perceive arbitrariness or unfair unequal treatment.