In my opinion there's no harm in wallet warning users about address reuse. Aside from the potential threat posed by quantum computers reusing addresses can lead to the loss of privacy. A warning could prompt users to think twice before proceeding, which I believe is a good thing. That’s why I voted YES.

P.S. I remember using some wallet that did show such warning, but I can’t recall which one it was ^{probably Sparrow, should check it}.