Good alert deduplication and dependency rules are worth so much. "Dear alerting, don't start throwing a fit about those 600 systems over there if you can't even reach the firewall all traffic to those systems goes through". Suddenly you don't get throttled by your SMS provider for the volume of alerts it tries to send, and instead just get one very spicy message.

Snark aside, this also impacts resolution time, because done well, this instantly points out the most critical problem, instead of all the consequences of one big breaking. "Dear operator, don't worry about the hundreds of apps, the database cluster is down".

This is why compilers for e.g. c++ should just halt after the first error, instead of spewing pages of template failures because of a typo elsewhere