I believe they have had working prototype products from both...

I believe they have had working prototype products from both Sony and Tower. They are what has been shown here many times already. And they played music. But like most prototypes they proved the idea was sound (no pun intended) but left a lot of room for improvement. That is what has been happening these past few years. The co has done this on the cheap, and while the time to product is long, at least it was paid for mostly out of their own cash. You clearly think this is a simple thing to do. And then factor in COVID.