Sadly, all those marketing words about the screen doesn't mean it can't be scratched. The screens are getting more durable without a doubt, but it can always scratch or break, so having a screen protector might be useful.
I personally bought a Spigen AlignMaster Screen Protector and I can't really complain, but many reviews on Amazon Germany are pretty bad because the protector has a black strip at the edges/corner. I didn't really notice, but seems like others do, so that's something anyone who buys a screen protector should consider :)