Fast Wireless Charging Backwards Compatibility

Everything I've read about fast Wireless Charging compatibility was that it was backwards compatible with the plates we have now. But now Samsung is saying we need to buy their option for that. I'm wondering if this is just a money grab of if I could plug a fast charger into my nexus wireless charging pad and get it to fast charge. Has anyone else even wondered this as they've read about this new standard with "backwards compatibility?"

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