Rails doesn't scale? Github's the largest code repository site in the world. Stripe's one of the largest fintech sites in the world. Shopify is one of the largest ecommerce sites in the world. There's also Airbnb, TripAdvisor, many others that are huge.
Also, you can write shitty, slow code in any language. You can make too many calls to the DB in any language. You can also scale to Google size in any language.
Python isn't a quick language. Also most of the ML bits are C++ bits. Ruby is faster than Python for most things. But Google (and others) have done well with Python (and other bits). Facebook got huge with PHP (which no one truly likes).
Ruby is a fine language (also very pleasant to use), Rails powers many huge companies, sometimes nitpicks are just that.
Also, you can write shitty, slow code in any language. You can make too many calls to the DB in any language. You can also scale to Google size in any language.
Python isn't a quick language. Also most of the ML bits are C++ bits. Ruby is faster than Python for most things. But Google (and others) have done well with Python (and other bits). Facebook got huge with PHP (which no one truly likes).
Ruby is a fine language (also very pleasant to use), Rails powers many huge companies, sometimes nitpicks are just that.