That's because they don't have to tell you. Simple ads are the most successful. Apple is one of the largest and well known companies in the world. Anyone who hasn't been living under a rock already knows the iPhone is the most smooth and secure smartphone in the world. They just made these ads as a little motivational push for consumers.
Yep, for 90% of people, these say more than any sort of spec/feature ad would.
Hey everybody, we've got APFS! Nobody cares.
Hey everybody, iPhones help keep the bad guys from getting your data. Excellent.