One less thing for new developers to learn. One less thing for each visitor to download. One less thing to maintain. JQuery is probably the least obtrusive fram

One less thing for new developers to learn. One less thing for each visitor to download. One less thing to maintain. JQuery is probably the least obtrusive framework though, eg you do not have to rewrite all your JQuery code every 3 year due to breaking changes. Also you do not have to compile your JQuery code to JavaScript, it's already JavaScript.