I went to a Waldorf/Steiner school, which shares some of these traits such as the lack of a focus on assessment and grading and the emphasis on creativity. We weren't taught the alphabet until the age of about 6-7 and basic arithmetic at 7-8. We did begin learning foreign languages at age 6, however. In practice my older brother taught me to read and count well before the Steiner curriculum did, but I still think tha…
My then-girlfriend and I did some work to help start a Waldorf school in western Massachusetts, so I've had a bit of direct experience with Waldorf schools despite not having attended one, and I agree with most of your assessment: the focus on creativity / learning to teach yourself is a huge departure from the traditional approach, "here is how we solve this kind of problem, now practice on these other, nearly ident…
As an aside, I think the biggest benefits I received from attending Montessori were independence and self-motivation-- I was never forced to learned something, I had to want to learn it first and pursue it myself.