Just like in a conversation - when you make your point, you don't quote the other person's exact sentence to make your own point.
Of course not, but you tried this once before, to have posts flow as if in a conversation, and it didn't work because the 'conversation' as such requires all participants in it to be online at the same time which is not possible. Conversation will be disrupted when posters reply the following day or many posts later.
I agree that there is no need to over quote but restricting to 3 quotes per post or said posts will be binned and warnings given seems ridiculous. So this means that I can write a couple of well thought out on topic posts containing 4 quotes, get a warning and have them binned, but I can talk to my hearts content about w.hores, faggots, s1uts, n1ggers, **** etc and if having a bad day, tell a couple of people in random to STFU, and not incur a warning. I would like to know why you are not addressing the problems here that many posters are complaining about. I don't post here as often as I used to for this very reason, PF has become more like The Jeremy Kyle Show, but with no sign of Jeremy to address the problems.
Personally, I would also be far less inclined to read lengthy posts with just a single quote at the start, but that's just me.