If your use case is a simple website, React is just a nice templating lib and you won't need to use any of the things people generally dislike about it. That AND your experience when you inevitably have to add some interactivity is going to be 100x better than vanilla JS.
As for the build step, there are many turn key solutions nowadays that "just work". And isn't a small build step a plus, compared to being at the mercy of a typo breaking everything? To me that piece of mind if worth a lot, compared to whatever manual testing you'd have to do if you work with "text" files.