The JS just fetches the text over the network and transforms it though. The browser still renders HTML markup in the end. I agree with the rest of what you sai

The JS just fetches the text over the network and transforms it though. The browser still renders HTML markup in the end. I agree with the rest of what you said but those are just design decisions. My point was that, regardless of the code headaches, the platform itself (HTML, CSS, JS) is an incredibly flexible and resilient system.