napyaddict, my experience of Swedish wsschools is twofold: having been in the system 30 years ago and speaking to my nephews and nieces and their friends who are going through it now
the way it worked then was, playschools did exist but were not that common; for many children (including me) school at 7 was their first contact with any learning or childcaring environment outside of your own home
otoh it was assumed in those days that most parents, including working class ones, would have valuable skills to impart: there was not the divide between valuable lessons taught by teachers and useless bumming around supervised by parents
by the time I got to school, I knew how to bake a cake unsupervised; I was well acquainted with the natural world around me; I could manage a saw and hammer and do basic woodwork; also basic sewing; and I could do basic household task; and I could ski and skate and swim and ride a bike
this was par for the course; it's about what my friends knew too (I also knew how to read and was learning foreign languages and various other things specific to my family)
when we started school, we did have literacy and numeracy learning, but they didn't take up as much of the day (learning to write is more efficient at 7 as children tend to have better motor control): a lot was history and geography and crafts
My nephews and nieces mostly went to nursery from an early age (2-3). There they did lots of crafts, they helped with meal preparations and learnt about different foods, they did a lot of nature trails and visits to museums and other places of interest. (Unlike here, the nursery teacher would take the whole class on public transport: they're a fearless lot ).
Children who wanted to learn to read could do so, but there was no pressure. They also seemed to spend a lot of time out of doors even in bad weather.
The crafts side seemed to me of very high standard (I've had some nice Xmas presents over the years; have never had anything from dcs' schools that would even last until next Xmas).
The parents were then given the choice of whether to let them start Reception at 6 or Year 1 at 7. My brothers' families have gone for reception, which is more play-based, but possibly less so than an English reception I(the children are, after all, two years older). Year 1 is certainly more formal, but they still put a lot of emphasis on crafts.