Well said. Re-usability of components is only important once you reach a certain scale application. Although I code in ReactJS all day at work, when I jump into side projects I generally use angular or even vanilla JS. If you are a developer that works on many varied projects you should pretty quickly come to this realization yourself.
I do happen to love JSX though — I think from a separation of concerns standpoint it is a huge step in the right direction. The isolation of markup, logic and styles is a vestigial tailbone of the web development organism.