Read the linked bug report. Concrete examples were given. A super glaring one to me is that: m.tumblr.com IS NOT a mobile version of tumblr.com If I tried, I

Read the linked bug report. Concrete examples were given. A super glaring one to me is that: m.tumblr.com IS NOT a mobile version of tumblr.com If I tried, I could likely come up with a ton more, but so could you if you tried.