[CjHuber]

I think your point doesn't hold up really. Telling an LLM to summarize something losslessly will loose so much more nuance than updating the plan directly every time when some useful information is gained.

That file is not even a plan but effectively a compaction as well, just better as its done on the fly only processing the last message(s) rather than expecting an LLM to catch all nuances at once over a 100-200k+ conversation.