I don't think you need to be enterprise scale to justify using a front-end framework. Anything above trivial complexity is enough and it will give you headroom

I don't think you need to be enterprise scale to justify using a front-end framework. Anything above trivial complexity is enough and it will give you headroom to scale as a bonus. I think a more common mistake is to use a framework when you could just as well render it on the server with the same result and being simpler at the same time. But when you do need to create a dynamic web app, you should definitely use a framework. Using vanilla will just result in you creating your own half-baked framework anyway.