You must be young if you're pointing to TLS libraries as an example of doing it right and not getting into trouble with insecure implementations and downgrade attacks. https://wiki.freebsd.org/LibreSSL
I wish I was young. Did I explicitly said TLS __1.3__ or did I not?
A lot of effort was put into making TLS 1.3 a stronger, less agile and more misuse-resistant standard than its previous iterations. And that effort worked.
