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Buying and supporting expensive laptops for every kid, with expensive education package subscriptions, all so kids can read a textbook on a screen instead of in a book.

Palatial buildings and sports field houses, bloated admin and special education aides.

Giving a bad teacher more money won't make them a better teacher. Maybe you can argue that offering more money to teachers will draw in qualified people from other professions, but this kind of solution can't be implemented in a vacuum. The bad teachers are already in the schools and cannot easily be fired because they're protected by politically powerful unions and furthermore, protected by a substantial portion of the public who hold school teachers on a pedestal and will resist any political move to make it easier to fire bad teachers.

The 50% in 30 years is not inflation adjusted. So both of your graphs almost match without inflation.

It actually is inflation adjusted.