There are reasons browsers do things the way they do. Experience and user studies have shown that users have a hard time decoding what error messages mean. "Th

There are reasons browsers do things the way they do. Experience and user studies have shown that users have a hard time decoding what error messages mean. "This certificate is expired, but only for a little while" isn't meaningful for people who don't have a mental model of what a certificate is. Furthermore, "downgrading" warnings increases the incentive to ignore issues, potentially causing more problems down the line.