DeletedUser227 If you worry about that, you should stop using your fingerprint unlock, entropy of which is roughly equal to 5 digit PIN.
Fingerprint unlock only matters in AFU. It’s a non-issue when phone is in BFU. People who use fingerprint do so for convenience when the phone is in AFU. If they find an exploit for AFU, then it doesn’t matter if it it’s a 90+ character password or a fingerprint, they’ll get in anyway.
However if it’s in BFU, then they need to brute force the 90+ character password. Thus, there’s no downside to using a fingerprint since it’s only relevant when the phone is in AFU.