Absolutely this. I stood up a negative test suite for continuous DB queries late in 2020 and it's caught many potential show stopper integration issues since; about 45% more YoY than pre-suite.
Took about a week of duplicating happy path tests, investigating gaps, and switching inputs/assertion types to get everything passing, but less than a week later we had our first verifiable test failure.
Took about a week of duplicating happy path tests, investigating gaps, and switching inputs/assertion types to get everything passing, but less than a week later we had our first verifiable test failure.