结合Flex和Rails有一个很好的论据吗？

Since Rails is already an effective Rich Internet Application framework because of the way it makes Ajax so easy, what is the argument for combining Rails with Flex and using Flex as the front end instead of HTML? A programmer friend of mine said he uses this combination because Flex is great for RIAs. My argument is that Rails is already great at that - why add additional complexity? Another big disadvantage of doing this, it seems, is that you cannot use HTML in your front end any longer because Flex makes this extremely problematic. That seems like a very high price to pay for whatever benefits this combination of technologies offers.Since Rails is already an effective Rich Intern