Chromebooks do everything I needed as a student and I loved them. This may make me a little partial. I see your points and I agree with some of them.
I would believe, or hope, the schools that are complaining about budgets would have crunched the numbers and went with what would be best for their budget. I'm not even sure who makes the decision.
Again I'm partial because a 200 dollar chromebook was a dream for me. The current Asus and similar models are even touch screen and can flip into a tablet and would be great for having to read.
I'm not sure what the correct answer is, or the best answer, but I'm team chromebook for schools.