Multiple response posts are prolly fine, but at that point, I'd probably just multi-quote in one larger post if they're t least semi-related. If they're two completely different topics, it sounds like a good time to branch to a new topic/thread for the other discussion. (Although the moderators here can't really be expected to assist with that given limited staff and high post volume.)

Regarding snipping quotes, I generally do that if I'm responding to a post that's on the same page, and perhaps only 1-2 posts above, when limited by character limits. (These forums are annoying, but not the only offender. And there are times where bypassing it with an edit is a pain, like on mobile.) Usually, I default to chopping up posts into the sections I'd want to respond to otherwise.