Sorry JP. Makes no sense at all, save not to put very large speakers in small rooms.
And a long narrow room with low ceilings is a corridor. Or a railway carriage.
Lose weight or buy better fitting pants
We talk about fixing the room constantly but couldn't the size and shape of the speakers be the problem?
I realize it is not economically feasible for manufacturers, but this could possibly relate to dyi folks.
For example a long narrow room with low ceilings would have speakers proportionate to the dimensions of the room. Smaller tweeters, drivers, with an enclosure mimicking the room. You would design the speakers to fit the room, instead of fixing the room. Start with the room as a extra enclosure. Make sense?