TLS 1.3 is now mature enough to be used in production. Since Cloudflare deployed TLS 1.3 at their edge, and Google added TLS 1.3 to Chrome, it is already being used by around 50% of modern clients.
ChaCha20_Poly1305 is a cipher suite that is very fast on devices without AES-NI (for example cheaper Android phones and tablets). It has been supported in OpenSSL since v1.1.0 and there is also a patch which detects when devices don't have AES-NI and automatically prioritises ChaCha20 regardless of its position in the cipher suite order.
Support for both of these in cPanel would be great.