[tomhallett]

I 100% agree with your first part, but offer a slightly different conclusion - Ruby on Rails heavily skews to small startups (for various reasons not worth getting into here). Startups also tend towards Senior engineers, because they don't have the bandwidth to train junior engineers. So those recruiters are often looking for "Senior Rails" engineers which is even harder to find.

If the above is correct, it presents an interesting question to junior engineers: is it worth it to learn Ruby on Rails as a junior engineer? While there are advantages to learning Rails (it's heavily opinionated, what you learn maps very well to what professional projects look like), there is more job supply in the "python + LeetCode" path (how that relates to competition - who knows).