Yes, flexbox is not supported in IE8 & 9, wrong spec in 10 and buggy in 11, therefore the 'terrible'. I'm talking in the context of websites that have to work o

Yes, flexbox is not supported in IE8 & 9, wrong spec in 10 and buggy in 11, therefore the 'terrible'. I'm talking in the context of websites that have to work on the open-web (where unfortunately a lot of people still use those versions of IE). For contrast if you work against a framework like Bootstrap 3, sites 'just work' all the way back to IE8.