Hi Spalding
Korg is not the only manufacture that adds new features for free with OS updates, if you look at Roland, Wersi, Bohm and Lionstracs you will find plenty of new free features were added as the OS was continually developed.
In addition just like Korg, all the above manufactures also produce optional features that have to be paid for.
Korg was actually quite late in embracing free feature updates.

Regards

Bill