The bitcoin is by many people believed to be used as a method of payment, just like fiat currencies, in the future. Apart from the other big use case of a stable store of value.
But the payment use case is very flawed currently. because from the day someone starts to make a payment and shows her public key around, everyone (also people who have malicious ideas) could start to track this person based on her public key for the rest of her live basically on the blockchain. Everyone using btc payments would be sitting "naked in a cup made of glass".
This is horror scenario for all, companies, private persons, a dangerous inherent feature.
this is currently not possible with cash or bank transfers. everyone can have your IBAN accout number, but no other person who has your IBAN (and is not a bank employee) can ever track you or know about your financial state, etc.
How can btc in such grave circumstances achieve mass usage status as payment method?? Is privacy not needed as prerequisite for payment use case?
How are bitcoin devs trying to tackle this unsolved issue? Or do you think this is not an important issue.