You weren't programming with LLMs in 2021 or 2022, be real. More like 2024 (that's already pushing it) or 2025.
The point is that it's easy to lose understanding of the finer details, even of a codebase you lovingly created, once this switch occurs and an LLM gets its hands on it.
The bridge is built. How do we test the load? Drive bigger and bigger trucks until it fails, note the weight, print the sign and rebuild the bridge the same way.