Probably editing other peoples' posts should either be restricted, impossible, or really non-obvious to find whereas replying should be a big fat huge button that's hard not to hit. :)

Restricted or impossible is a bad thing; the rest is like it is now, but apparently it's not enough for people who are used to the old way. :)

john wrote:

A notice saying "Hey, you're editing someone else's message! Did you mean to reply?" would really be all that's needed.

LiquidThreads has been replaced by StructuredDiscussions on all Wikimedia production wikis (except one, which will be done soon). It is no longer under active development or maintenance, so I'm re-classifying all open LQT tasks as "Lowest" priority.