So it's the old new again
Server side rendering is what we had in the 90's, and it was called CGI.
So this wonderful new technology is just another faster horse.
Anyway why would I pay a gazzilion dollars to AWS to render something which I can offload to the client for free?
Would the BBC recuperate that money in increased revenue? no.
Doesn't make sense.
Might as well just make sure the Javascript application is written properly and not vomit RAM and network resources all over the client.
Peanuts .. monkeys