Really? Looks like it’s just another approval hoop on top of the preexisting:
Arrival at border
Holding a valid ETIAS authorization does not mean you are guaranteed entry to a country. You will still have to meet the entry conditions of the border police. If you do not meet those requirements, you will be refused entry.
I mean, it’s possible you could be put on a terror list after getting your EITAS or you could murder someone on the way to the airport, so there’s never a guarantee that you’ll be allowed entry.