While Maps can be dangerous (The Map Is Not the Territory ↗) one which is well-implemented can dramatically reduce the friction to create a shared understanding. Like most great tools, it must be used responsibly with a commitment to maintaining it over time.

In the early stages of a project a map, even a bad map (perhaps especially a bad map) can be incredibly useful as a way to find the gaps between understanding in a group.

When a project has matured, where a map has been refined and proven, often alongside a pattern language, they can dramatically reduce the time to onboard new team members.