For classes that benefit from an Adobe design product then something other than a Chromebook would be the better choice. I don't think anyone believes there's any single product that's the best choice for each and every education need.
What do you want to do?https://www.google.com/chrome/education/webstore/app-packs.htmlhttp://www.cnet.com/news/living-with-chromebook-can-you-use-it-to-actually-get-work-done/http://www.maximumpc.com/can_you_survive_chromebook_alone_2014
According to the AI article iPads, Chromebooks and in some cases Windows machines were all tested at the same time presumably for the same tasks by some of the schools. Administration, support, screen size, integrated keyboard, perception of it as a work device, along with less expense in both support and upfront costs have all been cited as pluses for the Chromebook. Others here are no doubt familiar with some of the advantages of an iPad over a Chromebook.
What can go wrong with a Chromebook other than total failure? It loads a fresh copy of the OS every time it's cold-booted, and generally impervious to viruses and malware (because it loads a fresh clean copy of the OS at boot). I suppose there might be occasional wi-fi connectivity issues but what mobile computer doesn't at least once in a great while? It doesn't get much simpler than a Chromebook.