I find it to be the exact opposite. Replying in-line is great when it's a short email between a two people. But if the email is to a wide audience, has multiple back and forths, or new people get CC-ed later, in-line posting is much more difficult to follow. It takes so much effort to read the email to figure out who said what while also keeping state of all the different threads.
Top posting takes more effort to do well, but makes it much easier to follow an email chain.
Top posting takes more effort to do well, but makes it much easier to follow an email chain.