This is a bit sad but inevitable. They were trying to cover so much ground and execute to perfection. Whatever lead they had shrank with time and advances on fronts outside the hw and core dev may not see the light of day.
But it didn't improve enough to be useful for anything practical. The most useful thing I could make it do reliably was detect swiping your hand left and right. I was really hoping I could use it as a mouse replacement on laptops, but accurately tracking individual finger placement never materialized.