I'd say if it's timely content, e.g. you have a stream of comments flowing from the server to the client on a livestream then doing it all in JS is warranted, b

I'd say if it's timely content, e.g. you have a stream of comments flowing from the server to the client on a livestream then doing it all in JS is warranted, but the content has poor long-term value and indexing is pointless. Conversely if it's comments on Reddit, you can do any number of things that stop short of rendering everything in JS and I don't think your users will even notice. I think the overarching theme is that you end up having to think about these things: if it was clear-cut we wouldn't even be having these discussions. Do you want to think about wiring event handlers to DOM elements rendered on the server or about how your JSX renders on the server vs browser? A similar conundrum exists in mobile development, do you want to be thinking about implementing everything twice in standalone iOS and Android apps or do you want to think about how to get Xamarin/ReactNative/Flutter to do the thing you want.