But...
Most people overhere don't want a true open system in the end, they want a base system with unlimited expansion options, but they want a basic arranger system that comes with a lot of great styles incorporated..
And thst something that neither of these two systems can currently offer to an arranger player.....
The problem is not the hardware, it's the arranger software.
Having arranger software that only offers the functions of an arranger is only part of what is needed for the concept to work. It must also have a compatible sound engine that works well in playing back styles in the format the software supports.
For you to sucessfully get Live Styler to play back a Yamaha Tyros 3 style, you would need access to the Tyros sound engine. Because you don't have this, a software arranger will always require work in getting it to sound great.