Sencha was an easy choice to get our MVP in the hand of users. We have more critical features to work on that are orders of magnitude more important to our users.
No doubt. I'm on the side of "acceptable UI but provides maximum values through functionalities".
I used Ext-JS (Ext-GWT) before too on a (failed) startup. I'm not ashamed to admit that.
Yep, of course.
"Web desktop" is an awful UX idea and most of Sencha's UI components look they were designed by engineers.