While I doubt necessarily disagree with you, when or where would this be handled and what would be removed from the curriculum so there is room for metal illness awareness?
Our district is doing it. Nothing is removed from any curriculums. This is done during things like assemblies, weekly check ins with counseling staff, discussed during advisement (like a homeroom period) in high school, etc. At this level, they discuss more in depth about depression, anxiety, etc.
The elementary schools have a Monday morning huddle every week where the whole school sits outside at the start of the day and the administration covers a different topic for 15 minutes. It's stuff like kindness, recognizing bullying, being a good friend, taking care of others, including everyone, supporting each other, encouraging each other, etc. It's a way to establish a cohesive school community. This is as important as academics at this age. It's part of a program called PBIS (Positive Behavior Interventions in Schools) and SEL (social emotional learning). They also begin teaching mindfulness practices using a program called Calm Classroom. This can help kids with anxiety issues learn some ways to cope with their big feelings. A LOT of elementary aged kids experience anxiety, especially after the pandemic.
In middle and high school, everyone is assigned a homeroom/advisement class. The homeroom teachers do the same thing every week for one 30 minute period during the block schedule. The other open 30 minute periods during the week are office hours for extra help in whatever subject kids need. Kids have the same advisement teacher throughout their time at each school, and classes have all grade levels so there is a sense of mentorship also from older students.
Our district had made mental health a priority and they have done a great job, in my opinion. They have a vast trove of resources both on campuses and on the community that they can refer kids and parent to. They very much encourage students to reach out if they need help via a program called Speak Up, We Care.