I don't often find myself preferring the USA medical or clinical systems, so this is a new one for me, but...
I have to say, for me, having a simple way to say my level of autism quickly would be extremely helpful (I'm wondering if this is just because I still have speaking and language challenges).
I understand that they are limited and don't give a true picture of the level of support needs that exist for autistic people, and everyones experince differs and can not be placed into 3 simple boxes, but I think there is a place for them.
For me, the levels would allow me to quickly say to people, mainly professionals, what my support level is (not my support needs, just the level). It would reduce misunderstanding, conflict, frusutration and gaslighting, and it would reduce the trauma I experience.
I also feel the levels should be updated, as I believe there are more than 3.
I think at least 4 should be introduced, I think:
Level 4 - Profound Autism and High Need (with or without intellectual disability)
Level 3 - Early Developmental Delays and Significant Need (with or without intellectual disability)
Level 2 - No Early Developmental Delays and Moderate Needs (similar to the old Asperger's profile)
Level 1 - Not meeting diagnostic criteria but recognised Neurodivergent brain writing - low or no support needs (I think it's important that this is clinically recognised as it could help people manage their mental wellbeing better with better understanding and better treatment options).