Many people believe that bitcoin is used in the future as a means of payment, just like fiduciary money. Outside the other large case of use of a stable stock of value.
But the case of payment use is very imperfect for the moment. because from the day when someone starts making a payment and shows his public key, everyone (even people with malicious ideas) could start following that person on the basis of his public key for the rest of his life, mostly on the blockchain. Anyone using credit card payments would be sitting "naked in a glass cup".
It's a horror scenario for all, business, individuals, an inherently dangerous feature.
this is currently not possible with cash or bank transfers. Everyone can have your IBAN account number, but no other person with your IBAN (and who is not a bank employee) will ever be able to follow you or know your financial situation, etc.
How can BTC under such severe circumstances achieve mass use status as a method of payment? Is not confidentiality necessary as a prerequisite for the case of using a payment?
How are Bitcoin developers trying to tackle this unresolved problem? Or do you think it's not an important issue?