Technics ceased making arrangers because the numbers they sold were insignificant to Matsushita to matter. It doesn't mean the products weren't top notch or sold poorly, it just means the numbers weren't high enough for Matsushita to keep Technics viable to the corporation. When you're a multi billion dollar corporation, selling a few hundred thousand or so MOTL and TOTL arrangers is inconsequential. Those are the cold hard facts.

Yamaha is worth but a small fraction of Matsushita. What Yamaha may consider viable sales because a product generates a smaller revenue Matsushita sees it differently.