No, the sim itself is not that impressive compared to Unity or similar. They are, however, impressive relative to legacy React, which, as a development modality, has an enormous amount going for it. React and React-likes are winning in the marketplace because the development style it opens up really is that much better than many competitors. Yes, it's average everyday use cases driving that; no, that is nothing to be ashamed of.

There are many reasons you don't write a shopping cart in Unity, but now you can get a taste of performance nevertheless.

Props to the React team. (Yes that is a joke; I am passing props to the React team ;D)