I think TE didn’t do a good job in marketing the OP-Z before and after its release. The messaging and description was a bit vague at the start, and the marketing upon release has been barebones at best. It seems that I, and many others, are by now accustom to the OP-1 capabilities, and naturally expected TE to release a product to be the next evolution of their original flagship instrument. But like I said above, turns out the OP-Z is just a smaller, more distilled version of the OP-1. If you keep in mind the products that TE releases, and their spirit when it comes to music, the OP-Z makes total sense.
Perhaps TE didn’t want to turn away a chunk of their fanbase, knowing that they must be expecting something bigger than OP-1, so they remain low-key about the OP-Z.