I have a lot of mixed feelings about Neill's philosophy on education. His ideas about freedom in education are too broad. Students need more guidance and structure. They should be developed together.
Most academic subjects build on previous material.
So, allowing a student to just laze around because it is important to their personality at that moment could cause a barrier to their academic progress. The curriculum moves to fast in today's schools. His philosophy also doesn't coincide with the productivity related to the reality of the work force.