Pi was written by like one guy and it's better than this
To be fair, Pi only had to be useful. Claude Code had to solve the difficult unsolved problem of making a terminal print text, so naturally they built a small game engine [1] [1] https://x.com/trq212/status/2014051501786931427
Now, a mere human might have fixed this by removing the flicker-inducing clear-before-write, but Anthropic had a powerful AI-hammer at hand that was cleverly (after months of deep thought) able to turn this tough problem into a nail-like band-aid which they duly applied... leave the root-cause clear-before-write bug in place, and have the terminal cover it up by buffering and combining the clear+update !
Amazing times we live in!