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Sure, and those were good solutions for the time - nothing wrong with similar approaches in a modern context.

Big difference was that these had custom renderers. AMP renders in any web browser since they are just web pages.

Except mobile Web adoption in 2002 was poor because of form factor, among other things.

Oh sure. Though I'm not actually trying to criticise the idea of a subset, if anything I'd support it. I'm just pointing to potentially useful precedent. It's not a new idea.