Not all the fixed breakpoints are arbitary just for arbitrary's sake. The question a designer is often trying to answer is whether a device is a phone, phablet, tablet, or desktop. They're tailoring their interface not just to a size, but to a style of device, which makes sense. There's no other high-level way to really make this assessment.
I don't like the situation much myself, but sometime there isn't much choice. We don't necessariy want a small table to have a phone layout, or a phone to have a tablet layout (consider the means of interface, thumb, fingers, mouse, differ per device). Unfortunately the device manufacturer's haven't provided a clean solution.
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Not all the fixed breakpoints are arbitary just for arbitrary's sake. The question a designer is often trying to answer is whether a device is a phone, phablet, tablet, or desktop. They're tailoring their interface not just to a size, but to a style of device, which makes sense. There's no other high-level way to really make this assessment.
I don't like the situation much myself, but sometime there isn't much choice. We don't necessariy want a small table to have a phone layout, or a phone to have a tablet layout (consider the means of interface, thumb, fingers, mouse, differ per device). Unfortunately the device manufacturer's haven't provided a clean solution.