The main thing is that Sencha needs to polish polish polish polish and just keep on polishing until ext shines like a diamond in every possible way.
I am a refugee from Adobe Flex. Adobe builds Flex stuff and then say "it's finished!" and then it moves on to build the next shiny thing. Adobe does not polish, improve, polish, improve until Flex is best in class. I will never design another Flex app again. It is somewhat disturbing to see Sencha building new and shiny things when clearly ext needs lots and lots and lots more polishing. Animation software and all sorts or other tangents are clearly a drain on resources and focus, which should be going into the core product. What is the CTO of Sencha thinking? I am hoping that Sencha will continue to fix and improve and polish ext until it is the very best in its class, and then polish some more.
The message has to be continually hammered that the documentation of ext remains woefully inadequate, although I and others continually say it, the documentation situation has not been fixed.
For ext to succeed, Sencha has to stop all these distracting side projects like animation, fix the ongoing problem with documentation, and continue to polish ext. Fortunately, it appears at this stage that Sencha/Ed Spencer is continuing to work on ext, whether or not they maintain that focus remains to be seen. I'm hoping for ext to be a viable alternative to Adobe Flex, not yet another half baked, poorly documented, average product with the minimum feature set required to just get the job done.
Did I mention that the ext documentation remains terrible?