Not worked up at all, just trying to understand.
You just stated my point exactly (perhaps in better English?). I prefer this method over the ducker because it is not stuck with one fixed threshold and one fixed attenuation. Using an envelope follower to duck the delay gives me total flexibility on threshold *and* attenuation. That was the whole point. Not a different effect, just a much improved flexibility and control. You're right that it *could* attenuate the signal too much (if not properly tweaked) - you need to set it properly, that's all.
Yup. Nothing wrong with that approach!