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They had a GUI architect tool, but that tool never was up to date with the current framework version. Now they even seem to have abandoned the whole architect app. Also, to build a ExtJs app you have to use their tool (and then you have to pay, from that moment ExtJs is no longer GPL). But this tool also has lots of bugs. See More
You only get a limited premium questions that could be answered via the support and if the issue is too large then you might lose all your credits (it has a credit system for support) in one question. In addition the replies in premium forum are sometimes less thought of than you would get in stackoverflow. See More
The community is very small and this is because the licencing is very expensive. Therefore not many people to test the framework and give feedback in order to fix. They try to do everything in house which means that a small company (linkedin shows about 100 employees) tries to imitate something very large. The scaling problems lead to lots of bugs and instability. See More