I love both of these features and have been using 2FA for some time. Using Touch ID with Passwordless authentication is a great addition, but I don’t really need 2FA where I’ve used Touch ID. An option to disable 2FA for Passwordless login but keep if for a password login would be smashing 
I) came to the point to buy a Yubikey, and I have to say, I am disappointed about the passwordless authetication requesting the second factor TOTP.
II) Another strange behaviour is when I chose login with device or hardware key, I have to write my username, my email is not accepted, it says, passwordless authentication is not activated for this user. Just the email address is the email address of the user of which i entered the username, does anyone have a clue?