Not to make excuses, but there's a good chance some users here don't even know they can edit a quote. It is also quite possible that other people accessing this site from a phone don't have enough screen space to see the "quote" to which they are replying. My "flip" phone doesn't give me that kind of access, so I can't say for sure. Heck, I don't even know what some of the icons at the top of this "Add Reply" box do.
Chuck