Oh yeah I'm not really concerned about safety, I'm assuming parents are being responsible in that regard. My concern is social interaction, and parents staring at their phones and not even interacting with other parents. I get not all people like to socialize all the time, and finding alone time to read a book is rare as a young parent... but it's nice to just chat with people and put the phones away. I'm an introvert by nature so I like alone time.

If a parent is reading a book, I totally respect that! You don't see lots of people walking and reading a book everywhere they go, staring at a book to avoid social conversation, or unable to put it down for more than 6 minutes... phones just seem to takeover the brain, like TV but worse.