The losses are major: The community could prevent
speech that they deem
offensive, which is an violation of free speech in general, (especially
since people often consider differing viewpoints "offensive" and would
edit them out) and people would not have their comments represented as
written, which makes the discussion difficult to follow at best and
pointless at worst.
Jan-Paul Köster already pointed out to you that you have not shown that
this would actually happen enough to be a significant problem. Moreover,
I would like to add that you can go to any Talk page right now and
verify (pardon me, falsify) your theory.
Timwi