The Building Block Economy

Mitchell Hashimoto argues that the most effective path to software adoption has shifted from building polished mainline applications to creating reusable building blocks that others can assemble. Drawing on his experience with Ghostty (1M daily users in 18 months) vs. libghostty (multiple millions in 2 months), he contends that AI agents accelerate this trend by preferring to glue together high-quality, well-documented components rather than build from scratch. The building block model lowers the quality bar for derivative works, expands awareness to niche communities, reduces maintainer burden, and outsources R&D. He also notes that closed-source commercial software faces a structural disadvantage as AI agents demonstrably favor open and free alternatives.