Counterpoint: Dandelions
Pretty much the perfect plant that has nothing but positive benefits. People just decided they were a weed despite them being great for the soil, great for bees, lush, resilient, and literally every part of them being edible.
Seems like a straightforward solution to a simple problem. Pretty direct correlation with kids having access to smartphones vs declining grades and attention spans.
In schools that have started simply not allowing phones in class, grades have improved. This seems like the next logical step. Its basically just returning to pre-smartphone days. Schools used to confiscate phones if you had them out at all during school hours.
People will disagree with simple solutions, but those are often the ones that works. Phones cause problems, get rid of phones. Simple and direct.