Ben recognizes that jargon adds effort, he is just saying it adds effort to both sides of the equation, because the nature of specialized jargon is it is not known to all native speakers:
Still, it might add more effort for the non-native speaker because a native speaker can identify something as jargon more easily. This is only a hypothesis of course, so to make progress in this discussion it might he helpful to review the literature on this.
Ben recognizes that jargon adds effort, he is just saying it adds effort to both sides of the equation, because the nature of specialized jargon is it is not known to all native speakers:
Native Speaker: Content + Jargon
Non-Native Speaker: Content + Language + Jargon
Still, it might add more effort for the non-native speaker because a native speaker can identify something as jargon more easily. This is only a hypothesis of course, so to make progress in this discussion it might he helpful to review the literature on this.