While I hate that they start so young, *at least* it's learning through play the first year or two. I think having waited to have kids until my late 30's has made me appreciate the opportunity to "just be a kid".
Maybe it's just me, but I don't see the issue with starting school at age 4. I did and I never felt like I missed out on 'just being a child'... if anything, I feel like it made my childhood better.
It's not like you do 'proper' work for the first year or so anyway, and it gives you a chance to meet and interact with other kids and make potentially life-long friends. I'm actually Facebook friends with almost everyone in my primary school class and I still bump into a few of them now and then, even though it's been nearly 24 years since we left the school (and some of them live halfway around the world now).
My vague memories of Reception class (it was 30 years ago!) involve playing with sand and water, playing outside, having afternoon rest time, being read stories and doing arts and crafts. Then again, I think times have changed a bit since the 80s. I didn't get any homework at all until I started secondary school, whereas, my brother, who is 7 years younger than me, got homework during primary school.
Having seen the mountains of homework my US cousins used to get in elementary school, it makes my primary schooling seem like a breeze
.