Popular shows of 80-90s avoided trauma and ambiguity. Everything was simple and morally clear.
Then there was a huge counter reaction overload where we got Anti-Heroes, Moral Ambiguity, Trauma, "Realism" etc in every other show.
As viewers got tired and yearn for hope, faith, meaning, sincerity we got another wave (Ted Lasso, Reservation Dogs etc). Similar to the writing in Bluey they takes us back to Sincerity, but much smarter since they don't avoid Trauma. And show the viewer how healing and connection happens without power struggles.
Its basically a response to cynicism and fatigue. With comfort and care.