Top posting ALWAYS makes sense when the poster has included nearly 200 lines of redundant and time-wasting waffle from previous posters.
Scrolling down - all the way down - to read a few words is time wasting and irritating.
Until posters ruthlessly exclude all redundant material, top posting makes sense because it is the fastest and most efficient method of conveying a response to others on the mail list.
There is an art to replying intelligently to a previous posting - interspersing replies to the previous poster's comments BUT ALWAYS EXCLUDING SURPLUS TEXT.
I blame M$ for introducing TOP POSTING.