The real strength of React is that each component is a function which is an easier mental model than the spaghetti code Svelte componets turn into with special syntax which isn't even Javascript.
Right, it’s HTML. It’s a bit like JSX but not embedded.
I also find arguments like this quite weak. YouTube, Facebook et al work like absolute horseshit compared to other websites and web apps. If anything, they proof that these big companies manage to make simple web applications as bloated and slow as possible.