Done lots of research into the use of technology in (university-level) education, and the conclusions that you came to are relevant there too. The problem is that the buying, distributing and supporting of laptops or tablets is by far the easy part, so it is the bit that gets done. The hard part is in understanding that, as the device gives students access to all the facts that the teacher would normally regurgitate and allows for advanced things like running simulations, the learning approach needs to change. Laptops and tablets are amazing tools for supporting student-centred problem-based learning (and other pedagogies where the student discovers the 'facts' or explores the concepts and their application). Unfortunately, this requires teachers who understand the pedagogies, technologies and can deal with not being the 'source of knowledge' in the classroom, and students who are able to take control of their own learning and not just expect to be told the things they need for the test. Ultimately, it requires the nature of formal education to be reconsidered (what are we testing? why are we testing it? etc.) It isn't easy, takes lots of time and money and there is little desire to do it.
tl;dr: formal education today is still based on the needs of the industrial revolution, where a certain level of standardised knowledge (and no more!) was desirable for people to be able to work efficiently in factories. The nature of the world now means that people need to be adaptable individuals rather than automatons, and that means shifting the emphasis from teaching to learning and enabling people to develop into resilient individuals with the capacity to apply their prior knowledge to rapidly changing situations.