I don't think anyone has suggested that such a manoeuvre is anything but a display manoeuvre or sales pitch to emphasise agility of the airframe.
And I believe Tommy Thompson with his S-52 loop and Tex Johnson with his Dash 80 roll would agree 100%. Matter of fact, I think when the Boeing CEO asked Tex what was he thinking of when he rolled a "707" in front of industry leaders over Lake Washington, Tex replied, "Selling airplanes." Always enjoyed Charly Zimmerman's sales pitch in his BO105 as well.