Before this update, Monero relied on Ring signatures to hide the sender’s identity. To do this, Monero obfuscates each transaction so that it appears to be sent from a group of potential senders. Unlike Bitcoin, where a sender can easily be picked out through Ring signatures, this makes it rough for third parties to determine the actual sender.
The integration of FCMP++ on the mainnet takes this a level higher, enhancing transaction privacy. Technical data shows that through this integration, proving the output spent in a transaction, and thus, the sender, will be even more challenging.
If anything, developers claim FCMP++ boosts the current anonymity set from 16 to 100 million. Therefore, third parties, including analytics platforms like Chainalysis, would find it hard to trace XMR transactions, translating to a higher level of confidentiality for users who treasure privacy.