Here is how I propose browsers address web bloat:
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Stop adding features unrelated to accessibility, security, privacy, and internationalization.
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Adopt a default document policy that restricts oversized assets and download size.
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Make JIT-compilation a per-site opt-in permission. That should rein in over-reliance on JS.
This should mostly contain the bloat problem without significantly inconveniencing most users, which is why it will never happen.