Greetings and thanks for your honest feedback.

Let me speak for my company which works in collaboration with KETRON.

Arranger keyboards (in general) are usually European-based & focused, meaning most of the input in how these instruments are designed, and features incorporated (regardless of the company) has a lot of European influence - and rightfully so due to the nature of music and the history of where the Arranger was born.
The "Americas" are not heavy on using Arrangers and prefer to use Workstations/Synths in part because of the limitation the Arranger presents which includes lack of CONTENT. Here is where we come in to bridge that gap both in content and features, hence ENHANCEMENTS. Creating these enhancements requires parts and labor that someone has to get, design, put together, and market. That is why these enhancements are not just packed within the original instrument and everyone FORCED to purchase stuff they may never need or use. For those who believe these ENHANCEMENTS are a must or find value in them, they may choose to purchase and have installed in their existing instruments.

Again, same applies to many other goods we get today ... you get a Mercedes car, you who thinks the AMG component is a must, will CHOOSE to purchase this at an additional cost, or someone who gets a BMW but believes they would like the enhanced ALPINA version - as you see, this applies to many other areas of various industries. If BMW made all cars with their ALPINA enhancement, that would not be fair to the person who just wanted the option to buy a plain BMW X7 and not care for the extra 120HP the ALPINA version offers now, would they?

Hope this presents this in a perspective you and many who share this view will understand, and thanks for your honest question - hence the honest response.