Am instance of the role of home/parental influence -
At outstanding state school: year 1 DS is encouraged to write sentences.
At home: DS is actively helped, daily to write stories, letters and reports. His stories have beginnings, middles and ends. There are characters and plot twists. He uses complex adverbs and adjectives. He combines different sentence types. He proof reads and edits his work. This is a direct result of parental input daily.
Another example -
At outstanding state infant: DS does PE, and singing with his class.
At home: DS gets weekly piano lessons at a splendid studio, he ice-skates, plays on the under 8s cricket team at the home of our county cricket club, and swims twice a week.
Final example :
At outstanding state primary: DS is encouraged to read his work out loud when possible.
At home/parental input: DS does theatre and LAMDA at a performance arts academy focusing on public speaking; he’s actively involved in Musuem and city trips with his mum who shares her profession/passion in research and public speaking with him.
This picture could be very different with the exact same school - with different parents/home.
So whether private is worth it and by how much and to what degree it’s worth it depends on a whole host of factors.