I keep seeing this type of thing popping up. The short answer is because people are expecting more from the web.
What interests me is why are so many people perturbed by this. If I look through my bookmarks, pretty much everything could be server side rendered without any need for JS. It’s all stuff like HN or news sites. I wonder if the OP and others who have asked this before see the same thing: the consumer internet sites they most visit don’t need complex JS. But that doesn’t describe all sites. There are plenty that do require a lot of complexity.
What interests me is why are so many people perturbed by this. If I look through my bookmarks, pretty much everything could be server side rendered without any need for JS. It’s all stuff like HN or news sites. I wonder if the OP and others who have asked this before see the same thing: the consumer internet sites they most visit don’t need complex JS. But that doesn’t describe all sites. There are plenty that do require a lot of complexity.