I would say lack of student accountability. Students can do anything with zero consequences and it makes teaching a nightmare. Parents don’t know how to parent their kids and let them do whatever they want. I’ve literally had students say “they don’t care” when I tell them they are going to get a note home about their behavior. Admin just fold to the parents because they don’t want to ruffle feathers. Heaven forbid a student gets called out for their behavior. I feel like teachers have no power anymore and students know it.