Another issue is part of what makes a company valuable is their biz logic. Moving all of that to the frontend means you can no longer guard it. Even if you can

Another issue is part of what makes a company valuable is their biz logic. Moving all of that to the frontend means you can no longer guard it. Even if you can extract it to the backend, how many REST/GQL endpoints use a single query? And where do the parameters get supplied if not from a route specific handler?