On the other hand, using React means you'll have a 2nd source of state (form & navigation at the very least) that needs to be maintained and tested for edge cases. Everything needs to be validated 2x, since you can't trust anything coming from a client anyway. Correct state management between page navigations is definitely not something you get for free judging from the number of broken React SPAs where you can't properly use multiple tabs or other browser mechanisms.
