Because there are a lot of people on this list who are interested in
spreading information on the wikis, which overlaps with an interest in
there's a discussion about how
to be able to use MassMessage when using the new "Page to be sent as a
message" function, which would require an easier way of adding a timestamp.
My suggestion is to add it automatically, since MassMassages are going out
to discussion pages of different kinds, and should be timestamped. If you
have a workflow where you don't want your message to be timestamped, please
let me know off-list or in the Phabricator discussion.