That is true, but I feel like sometimes if the conversation contains useful rational it can help to keep it. I think sometimes it is a judgement call, I will sometimes compress the context first.

If I feel like the model and I explored a lot of options I won't want to keep context as it might be confusing.

I think the more you use it the better judge you are of whether you should purge, compress, or just keep the context before executing the plan.