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That's all good if your sink supports sinking 20V, but some don't. Anyway, those tables describe minimum required currents for a given PDP:

  https://megous.com/dl/tmp/a4111a84934c8c8f.png
Sources can support more and it's not against the spec, as long as you detect the 5A cable.

  https://megous.com/dl/tmp/1eccbf102295a676.png


> That's all good if your sink supports sinking 20V, but some don't.

It's not like you go directly to 20, you go one step at a time.

> Sources can support more and it's not against the spec, as long as you detect the 5A cable.

They can but how many do? If you want to play nice you shouldn't require that for your device.




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