If Kindergarten were just play based schooling then I’d agree with you. But there is an academic component, for example learning to read, and students abilities can be radically different.
Perhaps, but then surely reading should be part of the curriculum at least by by grade 1 or 2 then?
But if reading is part of the curriculum (which it generally is for K and certainly for the years after) then it’s just the reality that there will be big differences in ability and trying to have everyone go at the same pace doesn’t serve either early or late readers.
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.
Maybe it's because I'm old and things are different now, but back in the day, first year of primary school was when everybody learned to read. Some kids already knew some (incl. me), and that didn't necessarily make life easier for them since some parts of class they were then bored. Well, you learn to deal with it.
It's not like such situations never occur in adult life. I often find myself in work meetings where colleague A explains something to a group of 10 people to get everybody on the same page, and there are often one or two folks who already know this stuff and are obviously uncomfortable for those 10 min of intro. Clearly, they never learned how to deal with such a situation.
since some parts of class they were then bored.
Well, you learn to deal with it
It's a crucial life skill.
I'm highly doubtful that forcing young kids to be bored (by making them progress/learn slowly, when they could be learning more) is the best way to do it.