Yeah moving from python to node for concurrency is insane.

Moving from Python to Node for per-process fully-fleshed out async and share-nothing concurrency however is perfectly sane.

Using any of them for backend is insane, but what do I know, I have to suck it up and use Next.js for some SaaS extension SDKs, while I would rather be using JVM, CLR, or even Go with its spartan design.

JS haters could stand to understand the language has strengths even if it has well known warts.

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That's the main reason to move. Same reason people moved from Java to Kotlin, except that might change now with vthreads.