I think a lot of you are missing the point here.
Scottish tuning and also French Musette was designed in the days before amplification, to cut through the noise of a hundred jolly locals energetically dancing a "Strip the Willow" or a "Broons Reel" and suchlike tunes.
Try that with your puny straight tuned accordion and you would be booed off the stage (or even worse) because no one could hear you and they wouldn't be able to dance.
As was said. It's horses for courses.