I like calibration but I don't want to live and die by the graphs and charts. There are some perceptual advantages with a multi subarray like decrease localization. Having dedicated mid bass components create better transients then asking my larger subs or speakers figure out the mid bass. And I want to clarify I am definitely not against expensive equipment I would love to have four sigberg audio 10Ds) , I just think that a lot of people are not getting the most of what they already have
Many subs are certainly a good idea, and dedicated capacity for the midbass is also a good idea.