> I've been doing web dev for 30 yrs
That would be impressive, since Mosaic is only 29 years old at this point :)
I don't thinking people are reinventing server side rendering. Rediscovering it, perhaps. It has always been here, along with plain old HTML and PHP. The modern toolbox of JS-based toolboxes exists for a reason: all the things that you can't do (or can only do very clunkily) with server-side implementations. That hasn't changed.
What people wanted from a web page in 1994 is so utterly different than what many web pages are expected to do now. If it's a spiral, it's one that is spiralling out, not in, as the scope expands significantly.