Oh, I can assure you that, YES, that many young healthy bassists, or roadies, definitely COULD carry my whole Bassman 500 (hybrid) head bolted to my Bassman 115 NEO cab at approx. just 70 lb.s. It IS that securely fastened together with the heavy duty piggy-back bolts! In my younger days I sometimes carried that, or more, quite a distance!
(Hence my back surgeries.) But this is moot since it wasn't "sold to be used as one."
Hmm, but this makes me wonder if the Genz Benz Shuttle combos could meet that criteria? I'm not familiar enough with their amp-attachment bracket to know if the handle is meant to "handle" the full combo's weight? But, again, this is moot since they have been accepted since day one of the club.
I don't believe this has actually been considered at all. I don't see it being "sold to be used as one", though. And, if lifting the cab by just one handle, and tilting it, I wouldn't trust the magnet to hold the head on.

While latches facilitate converting from one-piece transport to two-piece usable "combo", I don't think they were mentioned in the acceptance criteria. " Cool", "unique", and such adjectives were used. But, IIRC, the hardwired speaker cord, however long it was, seemed to be an example of "sold to be used as one."