There are a lot of basic features missing from the flagship llm services/apps. Two or so years ago I built a localhost web app that lets me trivially fork conv

There are a lot of basic features missing from the flagship llm services/apps. Two or so years ago I built a localhost web app that lets me trivially fork convos, edit upstream messages (even bot messages), and generate an audio companion for each bot message so I can listen to it while on the move. I figured these features would quickly appear in ChatGPT’s interface but nope. Why can’t you fork or star/pin convos?