Well chatgpt doesn't know if there will be a follow-up question relying on the "irrelevant" information. So in general it can't remove it. Or at least it would

Well chatgpt doesn't know if there will be a follow-up question relying on the "irrelevant" information. So in general it can't remove it. Or at least it would require some more complexity to dynamically decide what is relevant and not over the lifetime of the conversation.