Getting up to speed is a human problem. Computers are so fast they can 'get up to speed' from scratch for every session, and we help them with AGENTS files and newer things like memories; e.g., https://code.claude.com/docs/en/memory

It is not perfect yet but the tooling here is improving. I do not see a ceiling here. LSPs + memory solve this problem. I run into issues but this is not a big one for me.