So the protection is that debit cards take longer to pay out to merchants? An increased window to dispute charges doesn't strike me as innovative but more like an arbitrary variable from the CC company.
With a debit card, your money is out of your account, immediately, and you have to fight to get it back. For some banks, for some accounts, this isn't a big deal, and you might have it back in a few hours. But for others it might take weeks, and in the meantime you've failed to pay your rent or mortgage.