To be fair I don’t understand even to this day what this metric achieves, the fact that tests execute 100% of your code, doesn’t mean that the tests won’t miss a bug.
In the world of agile development, where we make software that evolves over time, having 100% coverage is like shooting yourself in the leg, a lot of effort to write tests, tests are brittle because they cover all implementation details, a lot of effort to change code and rewrite tests.
I even worked at a company where they implemented mutation testing, where it would be literally impossible to change a line of code without a couple of tests failing.
