As much as I appreciate the sentiment, ring signatures are not a perfect solution for sender privacy at the moment given current ringsizes.

Almost every cryptocurrency with sender-obfuscation features bumps up against "poisoned output" attacks for low enough anonymity sets: https://www.youtube.com/watch?v=iABIcsDJKyM

But it is good enough for many purposes. The goal is to provide a high level of plausible deniability for the sender.