In general most people with an email don't know how to write an email, what is the right balance between top posting (sometimes it is faster both to write and read), and when instead an interleaved reply is needed.

And when the latter is needed, what is the right amount of email to take, what to remove, where to put a [snip], and so forth. I at this point think this is something that just programmers and other power users can get right.

I'm completely pessimist in the ability of the random internet aware guy to be able to reply well to emails...