May or may not be. I deal with a not small amount of customers that are on extremely slow connections where 30k less makes a big difference. You can do a lot in 30k. jQuery makes life a heck of a lot easier though.
I think this is a fair point if you genuinely want to keep your bundle size as small as possible. Many times, the people complaining about jQuery's size are serving 2 MB bundles. 30K is immaterial in that scenario.