That's exactly what I meant by "not scaling". Sure if you have much less developers than us and you don't make 100 deployments per day, maybe an SPA can work. I can assure you that when you need to support a complex product, it absolutely doesn't scale at all, even with some developers full time to try to fix the stack.
Our full bundle itself is close to 70mb and still growing every week, that's absolutely insane.