Regarding error handling: that's a valid point. From my conversations with @DHH, I understand that a set of debugging tools is on the short term roadmap. Even if that sounds rather understandable to me, for a nascent open source project, to be shipped without that kind of tooling at first.

Regarding network, from my understanding payload is never a problem when using Hotwire's magic :)

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But your answer highlights exactly what's wrong about the current situation : you use React because there's nothing else that seems to answer your needs. Not because you love it or need to code everything in Javascript on the front-end. Hopefully, an alternative is created to solve that problem, and maybe that's Hotwire.