Tailoring everything for Smartphones

Today I updated Firefox for Linux, the new UI design changes reminded me of how much I despise the modern design trend of tailoring everything for smartphones. I don't own a smartphone, I see how they are useful, but certain design elements that work for a smartphone are just really annoying and terrible for other users, and often times they are forced to be used by everyone (much thanks to the people who actually build in a check to see if the user is on a phone vs. pc and displays differently).
For Instance in Windows 8 those huge buttons, icons, that are perfect for fingers but really ridiculous for a mouse user and take up valuable screen real estate on top of looking childish. Since when did everything is being done in view of smartphones design ?
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