This can be nice if the feature goes live since many of our friends lose their money causing many scammers to use a fake website to get their target wallet. I hope this can available globally and for many devices and we also need to increase our awareness from the fake website don't let something bad happen twice with our metamask wallet.
This feature is already live but it will help only for known scams so if you connect Metamask to unknown scam that hasnt been reported before by anyone, you wont get any warning message and you might end up getting scammed.
There is no feature that is 100% bulletproof so you should always be very careful where you connect your wallet.