If you disagree with something I said, please disagree with it directly with reasoning, without name calling, ad hominem, or strawmans, at the exact thread. If I use terms incorrectly, correct me, and better yet, give an ironman of what I was trying to say.
To the extent that react is "stateless" (which I don't consider an accurate or useful term, because UI is inherently stateful - the meaningful distinction is whether state is managed or pervasive) so too is Wicket. That is to say, you declare what your UI looks like as a function of the model values. There is no "imperatively updating" and no increased complexity.