Since the launch of the new Twitter layout, I've seen that a lot of 

twitter profiles have backgrounds that aren't 'compliant' with the new
specs. Even the users who went out of their way to make Twitter
backgrounds that followed the old best practices haven't updated.

So what's the deal? Is it just too much of a pain? Do people not
realize that a browser window has to be 1400 pixels wide read their
background? Or is it just another confirmation that everybody uses
Twitter through apps. (mobile and desktop)

I probably wouldn't even notice if there weren't so many. It's the
kind of indicator that makes me nervous about the health of a digital
ecosystem. It's like driving through a neighborhood and seeing
billboards for movies that are a year old.