Some old-school lists might have a consistent style, but normal-people lists are more often than not top-quoted. Almost all email clients default to top-quotin

Some old-school lists might have a consistent style, but normal-people lists are more often than not top-quoted. Almost all email clients default to top-quoting, and bottom quoting requires more work, because you need to cut out irrelevant parts. It's not easy to get people who have never bottom-quoted to start.