If you have a single vendor, single cloud homogenous network where everything is documented, you know where every device is, and you know all the possible paths in your network, then you are a networking deity. Realistically, nobody has a “simple” and fully documented network. Mainly because enterprises grew over time with the organization.

Sometimes as a network engineer, you may feel like you're walking through a carnival where the barker shouts, "Step right up, ladies and gentlemen," promising something never seen before, only to find a poorly constructed paper mache replica of the impossible (or in our world, vaporware). Eventually, you become jaded and ignore the shouts until someone you trust tells you to take a look.