What a lot of people learn from lunch rooms is not a happy social lesson. It’s who is allowed to sit where, and who is outcast from a table. It’s the shit teenagers lower on the social hierarchy have to take daily from teenagers who are higher, even if they are allowed to sit at the same table. High school is widely remembered as a brutal rite of passage, and lunch rooms are as much a part of that as any other space. If everyone was so absorbed in their phones, that may have been a benefit for social harmony and escaping real-life bullying and shaming.