Chasing perfect diagrams is usually an exercise in self-deception, since the second the infra changes, whatever picture you drew is wrong. The trickier part is when the diagram becomes canon inside the org and nobody notices it diverged from reality years ago, so tribal knowledge beats the official chart every time.

Odd thing is, the only diagrams that seem to matter end up on whiteboards or living docs if anyone's actually building things. Few things age faster than polished Visio junk made for complaince audits and VP vanity.