Agreed Elixir/Phoenix + Tailwind is at the sweet spot of scalability, performance, and bonkers productivity.
Real time? Need to go distributed? Maximize # of features / developer bandwidth? Cutting edge machine learning training & model serving?
Mobile? JSON APIs and GraphQL tooling is great, but https://github.com/liveviewnative is moving fast so this stack almost has the exodia of full stack, one language, and distributed actor model based scalability.