This goes as far back as their late 1980s sampler. I worked in a store at the time, and we sold 3 and all were returned as unfathomable.
I love playing my CP4 but its UI is garbage and hurts your head to “get with it”. I remember when it was launched, their reps went to great lengths to tell us “there’s no such thing as a ‘factory preset’ in the CP4”. We all found out how wrong that was. I gave up trying to really understand it. It would be easier to figure out how they built the pyramids.
Some parameters in the CP4 will display a value, but there’s no option to change it!
Having said all that, any time I’ve moved away from Yamaha pianos (either acoustic or digital), I’ve regretted it big time.
but yes, their staff should be sacked. Is the CP88 better in this regard?