If youre intent on writing everything on the frontend in javascript then you can just have a frontend app and use webapi MVC on the backend. Personally, in my personal projects, I find I iterate faster if I dont't write any javascript. Every page is just static HTML and any interaction is done via CSS (which you can do perfectly well in razor pages) or html forms. Managing page state is a huge time sink and IMO not worth it, but it's what pays the bills lol