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Mainly this is because web apps don't work without javascript any more.
Without js the app will be slow and boring, for example you'll have to wait till the page reloads for any action - even voting.
Secondly - we'd have to write the app both ways - to support javascript/ajax and the old school way - that will add work. Not worth it since most installed browsers have javascript enabled, only the tinyest fraction does not. Not worth the trouble.