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is this really relevant anymore now that AI has gotten to the level it has? what used to take weeks to setup now take days (react, multiple backend services and infra)

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Very relevant, because it typically takes a lot less code to express a feature in Rails/Hotwire than it does in a SPA with a dedicated back end. No need to maintain API contracts or ensure your UI code is properly async/awaited, etc., etc. Whether its a human or AI writing the code, SPA's add considerable complexity that just isn't necessary for most web apps.

Lower LOC to express a feature means better context management which pays dividends for things like code review.

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