How so? Plenty of large companies still use Rails. Plenty of startups still use it. I remember when SPAs were all the rage, now every JS framework is doing SS

How so? Plenty of large companies still use Rails. Plenty of startups still use it. I remember when SPAs were all the rage, now every JS framework is doing SSR, just like Rails did/does. What full-stack framework is as complete *and* allows for the same speed of development?