Hitting "Stop" mid-response reveals two opposing AI design philosophies: Gemini restores your prompt for instant editing, treating AI as a tool for systematic iteration, while ChatGPT clears it and lets you scroll up, treating AI as a conversational partner. Neither is wrong, they're optimized for different behaviors: Gemini removes friction to encourage fast refinement, ChatGPT adds friction to discourage prompt fixation and support natural dialogue. The lesson: good design isn't always about removing friction, sometimes it's about adding the right friction to shape user behavior.