Agreed for the most part.
Some old tires do infact lose a certain performance to them.
We had one tire we found a Michelin Pilot Sport that was 8 years old and solid as a rock, would have had next to no traction on it for the most part.
Dangerous? Can’t say, we tossed it.
People do need to learn how to maintain there tires more then just check the dates on them.