To me the only framework that has really pulled this off is Phoenix live view and spinoffs, because they solve the fundamental problem: pipelined latency. The frontend has to request object A, wait for the result, then it has to request object B, then wait, etc, etc. There's too many combinations of objects, so it would be impossible to have an endpoint per specific request (I suppose graphql has sort of done this, but it's still not flexible enough for complicated transforms). Live view solves this problem by not really solving the problem, but moving everything server-side so pipelined latency is dramatically lower.