Flexbox has nearly 85% support in the US and 89% global support. Sadly, nearly 10% of people in the USA are IE8 users. These are users who are on Windows XP though, an OS which Microsoft has announced EOL on a while back, THEY don't even support it anymore. Not to mention, many of the people on XP using IE8 are large businesses who are really holding back on making the jump. Now do I have to put a large focus on making my site fully functional for the small chance that these select people will even visit it while they are at work? If I'm making a site for a small business, chances are, it's not that big of a deal.