I wouldn't say we consider it ok by any means. But we'd rather get the feedback earlier than later, so we said screw it and sent it out
I did something recently like this and ended up with an ugly "Select file" button when people are in IE.
I really hope IE are pulling their fingers out with IE10, it appears they are. We are getting a load of adverts in the UK now on Microsoft products, like Bing etc. It seems to me they are taking it seriously again.
I'm sure they will all support it soon enough and my days coding it will be worthwhile.