so crushingly dull that it destroys any natural curiosity that kids have

You are right. Children have a much earlier start to school in the UK compared to other countries. This cuts short the time of their “play-based” development. By Year 1 (about 5-6) children in UK primary schools are sat at desks and taught in quite bizarre ways. From Reception (ages 4-5) they are tested continuously to a point where UK children are the most tested children in the Western World. Other, more successful countries (educationally and economically) don’t do this. We have a weird, damaging obsession with testing children and placing them into hierarchies in this country. When testing becomes the purpose and goal of an education system it is, as you say “so crushingly dull”.