Sadly, Rails is simply not keeping up with the times.
Javascript has gotten really good and instead of embracing it, we reject it in fear.
Stimulus Reflex and Rails Link as mentioned above have active communities. It would be good to survey the newcomers and find the problems they see. Not just with Rails but with software development as a whole.
Ruby was much more capable back a few years ago, we even had ruby mobile apps with Ruby Motion.
P.S.
I also asked this engagement questions a few months ago: Community Engagement - Discussion/Feature Requests/Roadmap - #6 by yagudaev