@roadriverrail I will try to separate my specific experience at InPhase from the larger industry. I think there were large challenges that could not be overcome:
1. Engineering and production challenges.
2. Having enough interested customers.
3. The world does not stand still.
It's hard to take a product from optical table operated by PhDs to a device that can be managed by non-experts.
(I'm going to untag @djsundog here, but he can pop in at this point if he is.)