@mijostyn, you sound like the guys on the Home Theater Subwoofer sites. They too consider the SPL output capability of a sub as the only criteria with which to assess it’s quality. Linkwitz and Richie/Ding designed their OB/Dipole subs for the reproduction of music, not car crashes and bomb explosions ;-). OB/Dipole subs are not for everyone, and obviously not you. Each to his own!
I still have a pair of the original HSU subs utilizing cylindrical enclosures. Also a pair of KEF B139 woofers each in it’s own quarter-wave transmission-line enclosure, and a pair of sealed subs with 15" woofers. I bought the latter as a kit, and designed my own 4 cu.ft. enclosure: 18" w x 24" h x 24" d, inner cabinet (cross-braced every 5") separated from the outer cabinet by 1/2", that 1/2" filled with sand. Got that idea from Danny Richie, who posted plans for his 12" sub on his GR Research website.