It's not lightweight - the full library is just over 80 KB for 2.x. If you have devs good enough to handle it, it should be avoided as much as possible because jquery is often significantly inefficient.

Not to say there aren't instances where jQuery is fine to use. I use it for some apps as well. I don't feel the need to lie on jQuery as a crux for every problem though, especially having a decent understanding of cross-browser issues.

I think this is something worth considering by people.