It's almost like they continue to add nothing of value on purpose because it's admission they screwed up - they should have a tablet with macOS by now, including this feature.
In this case, revenue = device sales = popularity.
So you may think that you know more about product management and how to sell devices than Apple but given their experience it's a pretty tall claim.
Because freedom and power comes with tradeoffs. And many of those tradeoffs which come from multiple app stores, code execution etc are pretty unpalatable to most people.
Must be hard for them to screw up this badly.