The reception class at the school that three of my four grandchildren attended from the age of 4 (and that the fourth will join in September) seems to be very flexible on'formal' learning in those early years. Their main aim that year seems to be to settle the children in happily and provide a positive experience. There is a huge emphasis on learning through play, and no pressure whatsoever (not from the staff, anyway, though cant speak for all of the parents) on them to learn formally.
I remember when my first DGC started there - he was one of the younger ones (as was DGC number three, and as number four will be too) and could barely even stay awake through the day, and there is no way he would do any of the 'homework' that was suggested. Fortunately, when this was discussed, the teacher made it absolutely clear that the children should absolutely not be pushed to do it at that stage as doing that could so easily be damaging.
That first year was, and still is in that school, about laying the ground for the future, and it seems to work very well indeed.
I suppose that what I am trying to say is that just because we call it school, rather than kindergarten or anything else, it doesn't have to mean that the children are being pushed to learn any more than children of a similar age in other country where there is a different name for that level of childcare/ education.