I started Touch4j with Sencha Touch 1. Now Touch4j supports the latest Sencha Touch version and adds even more stuff to it. So I think I manage the changes from Sencha pretty well. Since I m using the tools for my own project It s part of my job to keep them uptodate. Also there are some big companies using Touch4j so I m not worried about production level. I hope to get to that level with Ext4j.
The main problem with the tools is to make people understand what GWT is about. When they hear Java they think applet
The tools I create are just delegating call the underlying libraries. So it s really easy to spot where the errors are coming from.
We choosed better productivity over possible errors.
I agree with you that people are very hesitant. But the tools are being used in production already. We use it at NTT DATA and I know other big names doing it already too.
I always suggest to download the libraries and play with them and then go from there.
I have lots of examples out there
Like I said you might not want to go back to anything else