

Biometrics are worst than a pin in a situation where your phone us hooked up to Cellebrite, because most likely they can just take your fingerprints, or make you press the sensor by force. Or even worse with facial recognition, because they can just wave the phone in front of you to unlock it.
It’s generally not super good otherwise either, at least not as a reliable way to derive an encryption key while being tolerant enough to damaged skin and positioning and all.
Biometrics are a good compromise for daily convenience: most people care about if they lose their phones or it gets stolen, and a thief will just factory reset it and flip it especially of the full qwerty keyboard pops up. Biometrics are still usually backed by a PIN or password, so biometrics makes it bearable to use a strong password since you only need to enter it once every couple days. And that password is the encryption key, so in BFU state you’re safe.
It’s derived by both a key from the TEE and the PIN/password.
The reason for that is so you need both the user’s correct password, and the TEE to agree to hand out the key, which it may refuse to do if there’s been too many attempts. When you factory reset it just generates a new key, instantly making all the previous data permanently inaccessible. The TEE will also wipe the key if you unlock the bootloader or try to break in the wrong way.
It’s still only roadblocks though, extract the key from the TEE and you have unlimited attempts on what are usually weak 4-6 digit PINs. It’s not a lot of tries. Then you better hope you had a good password.