I think from a business perspective, the hiring pool for Rails is small and younger engineers don’t have an interest in learning Rails (check recent university hackathons). It takes a decently long time (2-3+ months) to upskill a non-ruby engineer to be productive in Rails (although this is dampened by AI tools these days) and many senior non-ruby engineers aren’t interested in Rails jobs whereas you can get an Node or Java engineer to come to your Go shop and vice versa. Rails can also be hard to debug if you work in a multi-language shop, you can’t map your understanding of Java or Typescript over to a Rails codebase and be able to find your way around.

All that being said I still use (and like) Rails, currently comparing Phoenix/Elixir to Rails 8 in a side project. But I use typescript w/ Node and Bun in my day job.