Just a little feedback. A few players will spend time working and understanding different brands OS. Other who are locked into a produce like Yamaha as an example just won't give or spend the time learning a new OS. It's just easier to keep to what one knows.

When we attend the twice a year seven night keyboard festival UK ( 800 + keyboard players ) A number sit in the Yamaha room day after day and never move around the festival to see the competitors products to even know what else is on offer.
There are no bad keyboards today and it's down to personal preference, but Yamaha do spend a lot of money on promotion and demonstration personnel into events to sell products.
At our keyboard festivals Korg do a very good job, but Roland don't appear interested by not supporting the Roland dealer in attendance.