They had to do more to make the game more playable on tablets and larger phones. Much of the traffic on the internet is now mobile. Ignoring that market is not an option anymore.
From an April 2016 Study:
Mobile Internet Statistics and Facts 2016
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There are more mobile internet users than desktop internet users; 52.7% of global internet users access the internet via mobile, and 75.1% of U.S. internet users access the internet via mobile.
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Mobile media time in the U.S. has exceeded desktop, with mobile media time estimated to be 51% while desktop media time is estimated to be 42%.
8/29/2016 9:40 AM (edited)