@arnauldvm welcome to the forum.
Your statement is true, but it is a tautology. The same thing could be said about a random 512-bit cryptographic key.
Yubikey already offer advice on combining a short password (eg PIN) and static passwords.
What is a Secure Static Password?
How does static password work in a security key?
For this question, weâre going to speak to what we know which is static passwords in the YubiKey! We recommend you use the YubiKey in static password mode for only part of your password. To do this, manually enter a simple and easy-to-remember first part of your password, then use the YubiKey to enter a strong second part of your password. For example, you can set your password to: Sunny33rcltrcihbkkiulnveuenervidliliifv where âSunny33â is manually entered and ârcltrcihbkkiulnveuenervidliliifvâ is stored in, and entered, by the YubiKey
This works as Yubikeys streams, thus appending, characters into the keyboard buffer
I setup the static password on the Yubikey long-press option using the Yubikey Manager. Very easy to do.
PS. I still use the same Yubikey (short-press) for 2FA as per the 2FA hardware key setup
Note the new Yubikey âSecurity Key Seriesâ do not support static passwords. They are far cheaper but only supports FIDO2/WebAuthn and FIDO U2F