Flash for business web applications - why not?

Question

I\'m in the trade of developing business web applications. They are mostly internal-use, sometimes with a partner zone, but rarely available to the public internet. They are

Answer 1

1. Deployment. You're dependent upon a browser plugin which your IT department may or may not be willing to distribute.
2. By using Flash/Flex you're basing your tech on proprietary software.
3. Closed source, so its a helluva lot more difficult to debug

Having said all that, I actually quite like Flex, but for the reasons above, I view it as little more than a toy.