You’re not really paying to have the presets in your device - you would only have those presets if you own the plugin already.
The plugins are seperate software - they run on a computer and don’t require a QC in any way. If you happen to own them, then you can use those sounds on a QC.
I don’t see it as THAT appealing, but it’s been turned into a talking point for whatever reason. Using the EVH 5150 or Fender Twin from Gojira, Friedmans from Plini, 2204 from Henson etc - they’re all in there already. There’s some argument about being able to access the fx, but that only really applies to the Archetype plugins and I’m not sure most of them are anything to write home about.