When I started school in Sweden at nearly 7, we did start by learning the alphabet. Of course a couple of us had already taught ourselves to read before then: in a literate society you can't stop someone who really wants to.
However, I do not think even the children who hadn't done this, even the very gifted ones, had spent the preceding 6/7 years being frustrated or unhappy because they "weren't learning". The way we saw it, reading books was one (albeit very enjoyable) part of all the learning you were supposed to do when you grew up. There were so many other fascinating things you had to learn too; and they were all valued by the society we lived in.
As a 7yo I was also expected to know:
how to bake a cake without help
how to do basic sewing and embroidery
how to do woodwork and basic carpentering, using a hammer and saw
how to swim and understand about basic life-saving
how to fish and gut a fish
how to keep safe in the woods and what to do if lost
how to ski and skate
how to fix lunch
how to do basic foraging and bring back berries for jam making
how to recognise plants and herbs around our house and know which ones were edible, which were poisonous and which were protected
how to prepare a wall or other structure for painting and how to paint
how to do basic gardening
My db who was more into technical things also had a good grasp of basic electrics and mechanics by this age, fixing domestic appliances around the house.
If any DIY was being done about the house, I would be expected to join in; I helped out in the kitchen; I even did some of the laundry.
Of course some of these things were dependent on where we lived, but most of them (baking, using hammer and saw) are the kind of things that could go on in any household, however urban; they were the things that grown-ups did and that made you feel grown-up.
The British system, it seems to me, rests equally on the (reasonable) assumption that learning to read English will take longer than learning to read a phonetic language and the (unreasonable) assumption that all the learning children can profitably do comes out of books.
A child who thinks he isn't learning if he is cooking family supper but only if he is doing worksheets has got that idea from somewhere.