it's just a mechanism to mix-up transactions and balances across multiple addresses. These "laundry" services exist for a while. The new Wasabi wallet just makes Coinjoin easy to use via Tor for a 0.3% fee. It's handy if you don't want to show your balance when you pay something but Monero goes way further... I don't think Bitcoin will ever go full private because it would be against the original vision of Satoshi. And sincerely, I like it like that. I think we need both private and non-private coins in this world.