Git history, call graphs, and change patterns contain more reliable tribal knowledge than any wiki. The problem isn't capturing knowledge — it's extracting it.
CODEOWNERS files are always stale. Git history tells the truth about who actually maintains, reviews, and understands each part of your codebase.
The monorepo vs microservices debate usually focuses on build systems. The real difference is in how knowledge is distributed and discovered.
Knowledge concentration is a ticking time bomb. When a key engineer leaves, the blast radius extends far beyond their code.