Posts with a historical lock notice look almost like ordinary posts. All that distinguishes them is:
- The absence of voting arrows, a minor detail, especially to people who are not habitual Stack Exchange users.
- The absence of the
improve this questionlink.
- A discrete notice under the question that indicates that “it is not considered a good, on-topic question for this site”. This notice often blends in with the protection and closure notice. It's well-known that users don't read, and we're not even making it easy for them to find this important piece of information.
Historically noticed posts should be indicated far more prominently.
- Put the lock notice at the top. That way, it won't blend in with the other notices, and it won't be lost below a potentially long question text.
- Use the deleted question style.
This is in effect what had been proposed by Jeremy Banks in Add the alternative of "delisting" questions; deletion is usually harmful overkill) and Pekka in Show embattled deleted questions to the public as if they were 10k+ users. As things stand now, the historically noticed posts are pretty much displayed as ordinary posts; we might as well not bother.