OK as the OP. I will not try to reply to all the individual posts but try to condense it as follows.
Firstly to the few who have done so please do not take what I say and then morph it into something I did not say. I have never mentioned family, I have never said my phone is left lying around unlocked. It isn’t.
Monzo are a bank, it is good practice for banks to provide security which works for all their customers. I deliberately include privacy in “security” - we’ll not get deep into the debate about which is which, because they are intertwined - happy to do that another time.
Monzo think biometric security is a good idea to stop people being able to get into the Ap, they do not provide a fallback to a PIN or alternative if biometrics don’t work. So some people have a lower level of security like it or not.
It happens that I use biometrics with other APs and they work fine, so it’s not the phone’s fault. Something about the Monzo implementation makes biometrics fail too frequently to be useful. I am not buying another phone to try to fix this.
ALL the other online banks that I have experience of (at least 6) have what I am asking for. Why can’t Monzo.
Regarding the debate about whether 3 characters from a password or a PIN adds any security, I would say two things. Firstly it does depend on the implementation and the way multiple false attempts are handled, Secondly if you don’t think they add any security why are you content that this is all that protects against being able to transfer funds etc.
As for the attempt to suggest weakness in my email, Amazon… security/privacy absolves Monzo. Rubbish. Firstly you don’t know how secure my email is, or if I even have an Amazon Ap.
I am asking for something very simple, a PIN alternative to biometrics for when biometrics don’t work (for whatever reason). That’s it!! Revolut, for example, do it very well.
Over my career I have seen a lot of security breaches and a lot of bad practice. Normally it’s carelessness, or lack of imagination, or poor communication. Monzo is the only example I know of where it is deliberate management policy.
Please if you want to comment on this please do so in a constructive way and address what I have actually said.