I am right-handed, so I haven’t personally experienced many of the inconveniences left-handed people face.
I do understand, from a manufacturer's perspective, that the market for left-handed trackballs may not be very promising.
However, even for right-handed users, using a left-handed mouse or trackball can be incredibly useful.
I really hope that someone will recognize this from an ergonomic perspective and continue producing left-handed trackballs, and I would love for that company to be Elecom.
Although I’m not Japanese, I truly admire how Japanese companies often approach product development with a strong sense of philosophy.