The comment you responded to was about not needing NextJS and you said it's impossible to just use React if you need multiple pages or need SSR.
How so? You can have an MPA with React. If you have a server (Even if it's not NextJS) then you can do SSR. Then you can hydrate with React and manipulate as needed. This is what NextJS does.
I didn't interpret the OP to be saying "You don't need a server."