So many drivers.....better sound or just more sound?

I am sitting in Seattle cut off from my job by the virus: the world all around me is going nutsy....so naturally my mind drifted to the question....."why so many drivers in some speakers?"  This has bugged me since i first heard the Pipedreams (twenty or so 4 inch drivers all the same in a row.... such a different design principle.  I would think you would want the best driver you could afford for a given application....cover the frequency range as accurately as you can afford and then worry about volume level, air moved etc.  For instance, i heard some McIntosh speakers at a friend's house a few months back.  they had 12 mids and 4 high drivers if i remember.  I guess maybe a bigger sound stage ?  That wan't obvious to me in my listening to them.   Am i missing something obvious?   Legacy speakers use like 11 drivers in a set of speakers.....how can they do that?  I would love to know the cost per driver of various speakers.    Not a deep subject but,  i am addled by rain, boredom and the fear that my 401 k is gone..........
Thanks