> I guess it goes to show that the governance and availability of a language have a lot more to do with adoption than the merits of the language itself.

Nearly every Google project eventually gets abandoned because the engineers that made it get promoted and move on to their next promotable projects. The root cause is the ongoing failure of Google's leaders to align employee incentives with the long-term interests of the company or human society.

Even if S4TF had become popular, I expect it still would become neglected and rot like most Google projects.