Well for one, you can use any client side tools you want since they will be server language agnostic. And as others have pointed out, having to learn a new lang

Well for one, you can use any client side tools you want since they will be server language agnostic. And as others have pointed out, having to learn a new language/framework/etc is going to introduce another huge risk. At the end of the day, a beautifully written app with the latest and greatest technology with zero users isn't going to help you build a business.