[notNow]

[0] by that I'm referring to the clean HTML that still looks semantic and has all the normal separation of views and styles whereas in React et al if one's inspects the code is just looks horrid.

Even though I'm a JS-first dev but I second that. ( HTML & CSS in JS ) is a bad idea and not considered to be progress from the messy yet working templating engines (JS in HTML).

Proponents love to argue that integrating HTML & CSS into JS makes it easier for testing since JS is amenable to thorough testing as opposed to HTML & CSS.

While this is partially true and template files are not straightforward to test esp when you throw app logic into the mix but it still manageable if you kept to a minimum to the view part only and don't go overboard with it.

Also and this is very important, It's a given that HTML & CSS are forgiving compared to JS when it comes to errors but that doesn't mean that it's unlikely for a developer to shoot himself in the foot or to introduce unwanted/unintended bugs in the app through them esp. CSS and these usually are harder to catch and fix.