A shop is not only broken when the page stays white. It is also broken when no order confirmation has gone out for three days because the queue has stalled, or when a plugin has been carrying a pending update for months. The extension adds exactly this inside view to the outside checks.
It adds the domains of every sales channel, including the language and staging channels you forget when adding by hand, and assigns them to a client if you like. In the shop admin the shop only sees its own domains and incidents, not those of other clients of the same organization.