Earlier quoted context omitted.
Oddly I never considered starting a new project with it, but now I'm questioning why that is. I guess I just don't see many new projects started in Rails, and nowhere I've worked the past few years uses it. I stopped using it after Rails 3, but I'll give it a try again in the next side-project I work on and see how it goes.
Server side rendered is still fantastic for the vast bulk of web apps. Turbolinks and a bit of care around performance and all you users know is you have a fast site. Not many apps really need the super rich SPA type experience.
It’s not perfect yet, but as a first version is remarkably capable already.