That personal tutoring leads to better outcomes is not the problem. That will obviously be the case.
The problem is how to bridge the gap in a way more people realize similar benefits.
The problem is how to bridge the gap in a way more people realize similar benefits.
https://www.nature.com/articles/s41539-017-0012-7 "Montessori education: a review of the evidence base"
but you just need to look at the montessori methodology to see how it works. it may not be as effective as pure one-on-one tutoring but it is certainly way more effective than regular classroom teaching.
keep in mind though that the name montessori is not protected and that there are many schools out there that are montessori in name only without actually having trained teachers.
the lack of good studies of montessori is frustrating to me. the montessori method is as scientific as education can get, free of any ideology or philosophy, unlike eg. waldorf, and therefore should be easy to apply on a wider scale. the teacher training is not expensive (about a year) and could easily be integrated into any general teacher education. the teaching material is more elaborate than just books, especially for the younger age groups, but the high cost now is mainly due to a lack of scale.