When you say OP you mean
I meant the person who posted it, not just the thread starter. So if I were to quote your post above:
When you say OP you mean
If that's what you mean, I disagree with you because If this was already implemented it means I won't have been able to qoute reply you right?
Qouting shows you're giving a direct response to another reply on thread. replies without quote most times on a thread shows you're responding to the original thread/post. And other times, those type of reply can be confusing as one may not know what you're responding to.
Qouting shouldn't be restricted to OP in fact, qouting the OP isn't necessary unless you're responding to a particular sentence in that OP and qouting the whole OP isn't appropriate.