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Sorry for the late suggestion, but could you flesh out this part some more?
It should be explained to a reader why this recommendation is being made, I don't think it's completely obvious as written. An example of the risk to server operators of not checking the hostname would be good.
I guess the main risk here is that an IRC network has other A record entries (or indeed a wildcard entry that points all subdomains at a certain IP address) that they may not want an STS policy stored persistently for - blindly sending the