Unit tests (which have to mock dependencies) have a very bad signal-to-noise ratio. Most of their breakages are caused by forgetting to reflect the latest implementation details in the test code (like mocking new dependencies).
I write unit tests only if the logic is completely encapsulated by the "unit". The less you need to mock, the higher value the tests bring. That's one of the reasons I prefer to work on monoliths, it's much easier to test almost-end-to-end.
