I would say that Rails has fully embraced SPAs as an option. With Webpacker you can have React or Vue installed by default. That being said, at one point we decided to start using React to handle the front end of our Rails app and it has become a huge regret.

Recently we decided to switch back to using Rails + Turbolinks + Stimulus.js and the development speed and experience have been so much better.

It's disheartening to hear so few young people are using Rails. In my 10+ years experience, I always get drawn in by the new hot thing but always end up finding my way back to Rails for the better.