[user5994461]

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.

[okket]

I read your posts. Your examples apply to HKPK (key pinning), not HSTS (enforcing TLS only).

[user5994461]

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.