When you understand that the w3c's protocols on creating and establishing those standards would always start with a proposal that would need data (like how many like this implementation and how many people/devs/companies are implementing this proposed spec) to back up the claim that this spec is the way forward... then you'll understand that the web standard will always start at these proposals.
Besides, these proposals has phases.
"Browsers should implement what w3c envisions..." <- I think what w3c envisions always start in those proposals... and technically, they are already doing it.
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