Earlier quoted context omitted.
The GWT thing threw me off as well. How maintaining a separate stylesheet per user agent could possibly be seen as an optimal approach is beyond me.
If you have an iPhone, would you rather have a stylesheet that has everything and the kitchen sink in it (for tablets and desktop environments, all the -firefox- stuff and IE hacks) or would you rather have a stylesheet just for the iPhone? Similarly, would you serve the full jQuery to an iPhone or would you serve the new jQuery without IE dependency which is much lighter? Heck, you might even be able to serve Zepto!
Re: You can make complex web apps responsive
#41jQuery 1.10.1 gzipped is 32kb. jQuery 2.0.0 gzipped is 29kb. Quantify "much lighter" for me?