Phil, I think you're not consistent w yr own logic there. You're saying xover based multi driver spkrs were poor in 2011, and have come no further fwd. And you were a fan of Zu in 2011. So, any comparison in 2011 would have been totally valid to reinforce yr view.
The poster of that comment was carrying a 2011 assessment forward into 2019. Nothing inconsistent at all. And more to the point, Zu speakers have made more progress since 2011 than have any crossover based lines extant then.
Phil