

Not every digital signature is legally binding, I’m afraid.
In my country, there are 3 types of it. A simple one (login/password), unqualified (encrypted series of numbers), and qualified (same as unqualified, but encrypted using certified means by government). The last two are stored on a physical drive.
The higher the grade, the more legal power the signature holds.
When signing it by hand from a tablet it’s the same as signing it personally where I live. Which, unlike qualified digital signature, can be used for any document.
I think it works best in combination with fingerprint scanner.
Like when your fingers are wet and are difficult to scan. Whilst trying to make the scanner work, face unlock just does it for you.
But, yes, if it were one or the other, fingerprint scanner is simply way more convenient.