The industry has gone back and forth here forever between thick and thin clients, and I view this as an extension. Largely we all use thick clients now (PCs, phones, and things with way too much compute power), and the move to chrome or chromium based browsers made the behavior predictable. The pendulum swinging back is really an acknowledgement that the advantages provided client side rendering, don't always outweigh the networking costs. Data visualization is one of these areas I wonder if the javascript methods provide a real advantage vs server side rendering.