Elixir has all that _and_ Erlang OTP's amazing guarantees. Hence I landed on it.

Elixir also offers LiveBooks i.e. you can create pre-made recipes with which you directly remote into your staging / prod and do stuff.

All that with immutability and potentially 6 digits of actors / green threads with a share-nothing architecture.

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RE: early Amazon / Google, sure. They made do with what they had and it was and still is a heroic effort. But can we agree that they succeeded _despite_ the numerous warts and defects of the PLs and their runtimes at the time? Not _because_ of them?

I feel that people latch onto the misleading "they succeeded with language X and are big, hence the language X is great" thing way too often. No. It's not true. The only thing that follows from "big company A made it big with language X" is: "company A has an amazing engineering team". Nothing else.