Assuming that a special-purpose tool services a given need better than a general-purpose tool, the only reason to prefer the general tool is because the market for that service may not be sufficiently large to bear the cost of supporting a specialized tool. But in a niche whose market is perpetually growing, the preferred tools will become more and more specialized over time and sticking with a general solution will become less and less competitive. A shrinking market may experience the opposite effect. Regardless of whether Jai is a useful tool, the question of whether to pursue specialized tools for game development depends on where you see market demand for those tools heading in the next decade.