Look, this is a technical bulletin board in my case, and when we say “x[n] = x[n] + x[n] - y[n]” (or whatever) we mean it. We don’t need a computer blocking us from posting.
I don’t mind the default behavior – although it is annoying… I just wish it were a little more flexible and obvious. The existing behavior has all the charm and helpfulness of an IQ 80 security guard.