Nice WaPo article from 2014 explaining why this is: <a href="https:&#x2F;&#x2F;www.washingtonpost.com&#x2F;news&#x2F;innovations&#x2F;wp&#x2F;2014&#x2F;09&#x2F;02&#x2F;the-unstoppable-ti-84-plus-how-an-outdated-calculator-still-holds-a-monopoly-on-classrooms&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.washingtonpost.com&#x2F;news&#x2F;innovations&#x2F;wp&#x2F;2014&#x2F;09&#x2F;0...</a><p>HN comments on that article: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=8260038" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=8260038</a>