It would be nice to be able to comment one someone else's comment. It would make discussing certain posts much easier. For example, on the thread where you can share your latest lot build, you could make a post sharing a lot, and then someone can comment directly on that post (instead of having to @ people and waste space making new posts every time they want to comment on a previous post)
Is there a reason this hasn't been implemented before?
Please let me know if I haven't explained myself well
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Plus, I can just imagine EA_Mai popping into a particularly busy discussion just to say, "Use threads! Thanks," at least twice a week. As for how much of an effect it would have, well... some people listen better than others.
As for people actually using the function... I don't think it needs to be made a huge deal of, I think people will just start using it over time even if there are no rules forcing you to. I could be wrong tho...