by Carleas » Sun Mar 20, 2016 8:07 pm
Yeah, from the back end, 'sent' is not really the right word for what's happening, since there's no server-to-server or even database-to-database communication. It's much more like publishing the post to a limited audience.
And I think reason for not allowing after-the-fact editing is that it doesn't really server a purpose. If it's already been read by everyone who will ever read it, what's the use of editing it? Which is not to say we couldn't come up with a case where such after-the-fact change improves communication, but it's much easier to come up with ways it could be abused, and the net benefit is either zero or negative.
User Control Panel > Board preference > Edit display options > Display signatures: No.