I think it's a key property that many don't know about, and they don't know about it because it's not showcased like the other properties/pillars. I think it would only benefit XMR to showcase this property. Has this topic been discussed?
Good idea, I see untraceable is a property of fungibility and it is becoming more mainstream as the masses start to comprehend the differences of various coins. There are no other coins that are 100% fungible besides cryptonote. Therefore I would vote to replace rather than add.
I see your point. In keeping with the 3 pillars, I added the bold green text to the text of the 3 pillars. The text comes from the Monero home page https://getmonero.org/home . What do you think? (Just so everyone knows, I'm not a XMR dev, just a fan/user sharing some of my thoughts).
SECURE
Using the power of a distributed, fully decentralized, peer-to-peer consensus network, every transaction is cryptographically secured. Individual accounts have a 25 word mnemonic seed displayed when created, which can be written down to back up the account. Account files are encrypted with a passphrase to ensure they are worthless if stolen.
PRIVATE
Monero uses a cryptographically sound system that allows you to send and receive funds without your transactions being publicly visible on the blockchain (the distributed ledger of transactions). This ensures that your purchases, receipts, and other transfers remain private by default. [nothing added]
UNTRACEABLE
By taking advantage of ring signatures, a special property of certain types of cryptography, Monero enables untraceable transactions. This means it's ambiguous which funds have been spent, and thus extremely unlikely that a transaction could be linked to particular user. Monero is also completely fungible, and this means that coins can't be blacklisted or blocked.