Addresses being used more than once is very damaging to privacy because that links together more blockchain transactions with proof that they were created by the same entity. The most private and secure way to use bitcoin is to send a brand new address to each person who pays you. After an address has received a coin, it should never be used again. Also, a brand new bitcoin address should be demanded from the recipient when sending bitcoin. Wasabi has a user interface which discourages address reuse by removing from the GUI addresses which have received a coin. It has been argued that the phrase 'bitcoin address' was a bad name for this object because it implies it can be reused like an email address. A better name would be something like 'bitcoin invoice'. Bitcoin isn't anonymous but pseudonymous, and the pseudonyms are bitcoin addresses. Avoiding address reuse is like throwing away a pseudonym after it has been used.