Wish people would stop depending on jQuery.
Old browsers can default to a normal form input.
Old browsers can default to a normal form input.
EDIT: PS: I also chose jQuery over any other lib just because it's the most wide spread. Personally I have worked with Ender, Component, RequireJS and don't use jQuery in all my projects.
That said, it does abstract much of the crap that goes along with XMLHttpRequests and all the cross-browser idiosyncrasies that go along with it.
I'd say at this point it's a matter of personal preference and performance requirements.