There wasn't much directed learning. We played all day. Indoors building stuff, outdoors in the woods. All that academic material with reading and writing and maths and all that, that's what primary school was for. Which started at age 6/7.
I'd say let kids be kids and have them explore the world through curiosity, not through a planned curiculum from age 3.
montessori is very directed but the key difference is that each kid is learning on their own at their pace. which means the kids learning is only driven by their curiosity. montessori materials are also designed to make learning interesting. kids can choose what they want to play with and after introduction to a new lesson are allowed to explore the material in their own way, which makes it very playful. teachers observe the kids and suggest new lessons to each kid when they feel a kid is ready.
I'd say let kids be kids and have them explore the world through curiosity, not through a planned curiculum from age 3.