I'm not advocating for or against jQuery or printf. I'm just pointing out that equating the two (in size, utility, or potential gains by avoiding them) doesn't make a lot of sense.
jQuery's ratio of size-versus-additional-utility is much larger than printf's, even more so if you consider typical use cases of each.
But it isn't even a fair comparison to begin with. How about comparing jQuery to libc. I'd still argue the ratio is in libc's favor, but no one would have written "I'm surprised that there's no youmightnotneedlibc.com".