Every time I edit a post I've made in order to fix a simple typo, the message is marked with "Edited." It's a minor annoyance, as none of us is perfect, and we sometimes need to make such innocent corrections after we read the posted results.
I've noticed that other forums that are similar to ours do not do that, so it occcurs to me that it may be optional. When I fix a typo in a message on the Vivaldi forum, no such tag is added to it.
The only reason I could think of for doing that is so that the meaning of a message can't be changed after someone else has replied to it. But that's already impossible. After someone else has accessed a message I've written, I can no longer save any changes to it.
So, if it's a feature that can be turned off, and it serves absolutely no purpose, why have it? If it's not a setting that can be turned off, then so be it. I'll sit down and shut up.
Edited by @kyrios after the answer of @tomscharbach. Do you still believe it has no use ? 😉