After reviewing 20+ verification projects, I see the same pattern: 5 well-written sequences All of them exercising the "happy path" Corner cases added as an afterthought at week 8 By then, coverage holes require surgical constrained-random surgery that takes 2x as long as getting it right in week...
Source: [Dev.to](https://dev.to/mritunjay_biharisingh/most-uvm-testbenches-fail-coverage-closure-for-one-reason-nobody-talks-about-and-its-not-your-png)