I'm doing Rails now, and I'd say no, it's just JS. Since Rails 4 was released particularly, most things upgrade between versions with only minor hiccups. The ch

I'm doing Rails now, and I'd say no, it's just JS. Since Rails 4 was released particularly, most things upgrade between versions with only minor hiccups. The changes are mostly adding new modules to have a standard way to do various common things, but the old ways generally don't stop working. You can upgrade to the latest Rails and switch over to the new module, or not, at your leisure. New Ruby versions come out pretty regularly too, and the changes are mostly improvements on speed and memory usage, and addition of new syntax types. I don't think there have been any breaking changes since Ruby 2.0 was released. I've worked in a few other languages, and I don't think anything else has the vibe of rewriting your whole system around a whole new popular framework every few years.