Because it was tested in a lot of devices, proven to be the best width for readability during testing, and to justify it you're offering a sample of 1 wholly based on your subjective view with an argument that is roughly "Why not!" which is about as weak an argument that could be made for a change that would affect 300 web sites and 250,000 monthly visitors.
Because it was tested in a lot of devices, proven to be the best width for readability during testing, and to justify it you're offering a sample of 1 wholly based on your subjective view with an argument that is roughly "Why not!" which is about as weak an argument that could be made for a change that would affect 300 web sites and 250,000 monthly visitors.