I think that kind of thinking is really suitable for the JS world of a few years back. If you're just using vanilla JS + DOM API, it can be pretty messy to incl

I think that kind of thinking is really suitable for the JS world of a few years back. If you're just using vanilla JS + DOM API, it can be pretty messy to include HTML in your JS. However React's setState handles DOM changes and rendering, so it's less of a pain. So in answer to your question of why people don't, I think it's because they're not viewing this as a problem anymore.