The OP mentions > They're forms that submit stuff to a server and get a response. So it sounds like they're not actually doing any of the things you mention.

The OP mentions > They're forms that submit stuff to a server and get a response. So it sounds like they're not actually doing any of the things you mention. For basic forms that just submit, of course React is overkill. Hell, a software developer is overkill for that. For any of the things you mention, React or another similar UI framework makes the project much more manageable.