I can imagine the feature set the native Windows driver advertises is different from the feature set DXVK reports. If DXVK doesn't support or implement certain

I can imagine the feature set the native Windows driver advertises is different from the feature set DXVK reports. If DXVK doesn't support or implement certain features that the engine then doesn't request of it (or if the API call translates to a noop), you could quite easily end up in a scenario where graphic fidelity is lowered, accidentally boosting battery life and performance. There were bugs where certain games wouldn't render certain shadows, for instance, which might not get noticed but still offers an accidental performance uplift.