structure, testing etc is the antithesis of a Montessori education.
This was not my experience of DS's Montessori pre-school. I have never been in a more structured, organised environment anywhere before or since. Children were taught how to greet the teacher (always shake hands on entry), How to open a door, how to pour water, how to handle a chair etc. etc. etc. This is all part of 'practical life/grace and courtesy'. Every part of the classroom environment was planned to the nth degree so that children could do things for themselves. "Teach me to do it myself" is a fundamental part of montessori, but this is done by demonstrating a set way for a child to do every single task.
There wasn't formal testing e.g. "now children sit down at your desks for your spelling test" but teachers were constantly taking notes on individual children e.g. on which phonics sounds they knew and where they were in maths. There was a set progression for each part of learning.
To be fair, the person who ran this school had been doing so for 20 years - I understand from blogs of montessori teachers that the theory and reality of having a 'normalised ' (montessori speak for ideal classroom) classroom can be different. I'm not surprised that 2 inexperienced people setting up a new montessori primary school found it challenging. Also, in this country, I think there are lots of montessori teachers experienced in the 3-6 years montessori curriculum, but there are very few montessori primary schools.
Some schools do have an unstructured philosophy e.g. summerhill, but that is not montessori.
Anyway, I sympathise with you Bund. It's not as though schools in general are coping with children on the spectrum.