This, then, is one more reason to avoid community wiki. If signatures and taglines are "strongly discouraged," and an answer is a wiki, then only the editor's information is left with the question/answer. The original poster is not shown except in the revisions, and is therefore no longer present in the conversation.
When I contribute good work to a question or answer, I like to sign my name as below so that it's obvious to everyone who bothers to read my contribution that I was the one who had the original thought or idea. If anyone else comes along and edits the content substantially, I have no problem with them removing it. It's not obtrusive, nor is it noisy. I could agree that links to businesses, images, friendly greetings or salutations might be considered too much, but the additional few characters are surely not a stumbling block.
Editing posts just to remove it seems excessive - but this is a wiki site and I certainly won't complain if my posts are held to a high editorial standard.
In previous questions, lots of people have mentioned that they don't even pay attention to the avatar and rep next to a question or answer. A signature solves that problem, and I expect that many people who visit this site have seen my posts with the signature and associate them together.
I believe there's real value in allowing people such recognition.