I always find it weird that everyone is bashing jQuery nowadays and offers Ract/Vue as replacement - isn't React/Vue working with blank slate and injecting page

I always find it weird that everyone is bashing jQuery nowadays and offers Ract/Vue as replacement - isn't React/Vue working with blank slate and injecting page content into container? jQuery usually works as "enhancement" for page content actually returned from server Are you all building websites like that? Returning blank page from server and then filling all content on client side?