Complements an earlier study
Too much Phones / Tablets / Computers holds back academic achievement generally. They are poorly integrated to teaching materials, distracting and without proper training and disciple even the "library / research" aspect is underused. Most people go to their favourite sites and have no idea how to search.
Tablets and esp. Phones make it harder to copy and paste any found info into documents.
You have work at it to have more than a text editor on Tablets / Phones.
Smartphones are largely communication and entertainment devices. Tablets are largely media browsing and entertainment.
Yes, I know you can install apps to create content, add keyboard etc, but dammed painful compared to netbook / laptop / notebook with OS X/ Windows /Linux. Even then in most schools a laptop/netbook is going to be a distraction, not an aid because kids have not been taught how to use one properly as a tool to aid study.
You still need good teachers, working out examples, attention to teaching, not being in an LCD illuminated enhanced personal internet bubble.
Amazon's trail of using Kindles (DX and DXG) for university was a complete fail not because eInk eBooks is a bad thing, but because even the Keyboard Kindle is garbage for annotation and overall ALL eBook devices have appalling GUI/software only good for reading short stories and novels. I've used 5 Kindles and Kobo Aura H20. The Kobo has a better home screen and access to list of books in use, but otherwise the SW is like a bad copy of Kindle.
I was doing better document management software 20 years ago!