I’m curious, on what are you basing this sweeping, all-encompassing claim? I would hope that you would have some citations (and NOT, please, an opinion piece, based on a couple of anecdotes).
My kid attended an elementary school in one of the most progressive communities in the USA. I can absolutely promise you that they 100% did NOT “abandon grammar, vocabulary, and direct writing instruction as well as complex literature analysis”. In fact, they did these EXTREMELY well. My kid graduated High School in 2019. It was a public K-12, BTW.