AI is dissolving the silos between design and engineering by enabling unified workflows where mockups instantly become functional code. Tools like Cursor allow designers to ship products without deep coding expertise, collapsing feedback loops from years to minutes. This shift de-emphasizes 'taste' in favor of intentional decision-making—without strong human guidance, AI outputs risk becoming generic. The discussion critiques fragmented modern development, advocating for a return to the 'complete builder' mindset through system-centric design, where modular architectures like Notion’s enable flexibility. AI should act as a universal interface not limited to chat, instead integrating into efficient interactions like autocomplete. Simplicity emerges as the core design constraint, shaping how features are structured and exposed. Ryo illustrates these ideas through RyoOS, a personal operating system inspired by classic Mac interfaces, showing how foundational computing concepts from 1984 still influence today’s AI-driven tools.