See?

Yes.

(Oh, I know that and I do that -- I'm probably not making my point very well -- but it depends on the circumstances. When I get an e-mail from my top-posting sister with a short question, I give her a short, top-posted answer. If I get an e-mail that contains a lot of stuff, but the point is "What time should I pick you up?" I do not generally edit the body of the original message to insert "6:30". Yes, a risk is that if "6:30? How about 6:45?" becomes a lengthy philosophical debate, I may have wished that I responded in bottom/interleave fashion. But I'm just a risk taker!)