Fingerprint is not secure, what about face unlock?
Barcode is good to use if you care so much about security of your BTC wallet on your device. A very good password with at least one capital letter, signs, number, punctuation, would give hackers or scammers or even AI tough time to dicipher the password.
This might be awkward to use by other people since many are worried about strange incidents might happen but if this is used by the user and properly handle in terms of security measures to avoid data leaking then this is really good added safety measures on everyone's account since no one can easily access your account unless if you say so. But for now to many skeptical about this feature so majority prefer to use finger print or pincode since they think its more convenient.