The problem discussed here isn't the use of CSS prefixed properties -- it's the use of ONLY CSS prefixed properties. Include prefixed properties and the official properties and when browsers drop the prefixes everyone is happy.
Well, unless their initial implementation was non-standard. But even if that is the case, if you don't update your CSS, including the non-prefixed property won't hurt your design more than leaving it out will.
Well, unless their initial implementation was non-standard. But even if that is the case, if you don't update your CSS, including the non-prefixed property won't hurt your design more than leaving it out will.