2. DocumentJS and StealJS are already useful for mobile development. There's a few other features that StealJS could use (such as progressive loading) to make it more attractive.
3. I'd really like a FuncUnit for mobile. But this won't benefit from something like zeptojs.
5. Time. This is probably the most important. To take on a mobile effort, I would need a lot off assistance.
This would be fantastic as we are starting to go mobile as well! Also with JQueryMobile and hopefully jMVC.
I think that's what Jean means is that interaction is slow with the larger frameworks. It's really important to have responsive and fast mobile applications.
So for that to happen the handling of user events (touch, click, swipe etc) must be really fast and streamlined by the framework and the selector engine optimized for mobile browsers. The rest (sensible DOM updating etc) is pretty much up to the developer I guess.
Has anyone seen some nice benchmarks between jQueryMobile vs. xuiJS vs. ZeptoJs ?