My oldest grandkids are 10, and this was the recommendation then. It's not new. But quilts can be used as wall hangings, used on the floor to provide a clean place for baby to play, etc. All my grandkids have quilts, either ones I made, or ones other friends made. None of them were used in the crib. All the quilts were appreciated.
Just think about the evolution of car seats!
I agree 100% with Tartan. "Everyone does the best they can with the knowledge they have at the time."