HSTS says "This domain uses TLS and ONLY TLS. Ignore insecure connections to this domain. Remember this for x seconds." (should be harmless these days, why should it backfire?)
You don't seem to understand. Read again, I gave many scenarios where a certificate will be invalid, that will block all access to your site if HSTS is enabled.
My examples are for HSTS. I gave examples where a certificates is invalid. TLS fails when the certificate is invalid and HSTS blocks access to your site.