The article links to that article, come on!
Don't people read stuff anymore?
On a serious note, you can't really blame people for not supporting a browser that needs hack for every single version.
Related: http://www.paulirish.com/2011/browser-market-pollution-iex-i...
I am well aware of the history and I hate IE < 10 too. I use FF as main development browser, and beside others of course Chrome and IE 11. The trouble comes when people only test their website with Chrome. I am using IE 11 as I have to at my workplace and it has by far the best UX (IMHO). FF still uses only one process and cannot handle my habit of using dozens or even hundreds of tabs in an optimal way.