My present understanding is that this is a result of the maximum output rather than the design of the speaker. Holding constant that a speaker can produce required SPL without getting too close to its maximum output/power handling, my statement would be true most of the time? In other words, of all speaker with 5" woofers, the ones with the best spinorama would more likely than not sound better than the other speaker with 5" woofers without regard to room size, even if it wouldn't be the best choice for said room.Spinorama by no means predict that it will sound good in any room.
A 5" woofer speaker with a good spin isn't going to sound awesome in a 20' x 30' room with high ceilings.
Perhaps we agree on this point generally but were making different assumptions about what "good in your room" meant.