Hi Korbinian, Basically you are right : now vanilla js can almost replace jQuery (and that's a trending as far as I can read). But from my point of view, jQuery is more convenient to use and still has the responsibility of the cross browser compatibility (what Wicket has suffered before opting for jQuery) One more important point: several integrations relies on jQuery like jQuery UI, Kendo UI and Bootstrap (and I will not shoot myself in the foot voting for a replacement :)).
Best regards, Sebastien.