Ring signatures are *relatively* weaker compared to it's two other tech layers. They're vulnerable to targeted statistical attacks because it is only obfuscation - they're not hidden with encryption like amounts and receivers are.
But full-chain memberships proofs are coming with the next major upgrade "Seraphis" which will get rid of ring signatures completely and resolve this.
Keep in mind, in practice, there has never been any documented case of someone being prosecuted or discovered because ring signatures failed them. A weak point for sure, but not as dire right now as some make it seem. It's mostly theoretical or future points of worry.