It's a good saying but the literal meaning is not entirely correct anymore. Climate change has changed the math on tree planting in a few ways. For example tree planting in your area today may backfire vs 30 years ago: https://www.scientificamerican.com/article/forest-preservati...

The best time to move your docs to your repo was 30 years ago. But now that they are written by LLMs, tomorrow's LLM will be able to write an even better doc than today's LLM. Nothing is gained in caching them now.