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The article didn't want to fall into the trap of implementing one feature twice on the server *and* with client JS. It avoids code/logic sharing. I agree it's fine to have pure client-side JS enhancements.

But I also think the fundamental question of PE & JS is how to build experiences where client-side JavaScript failure means falling back to lower-level enhancements and ultimately the server.
Modern frameworks like Remix revolve around solving these problems, for good reasons.