My feeling is that unit testing is so popular among developers because it's developers that get to decide the requirements. Don't really feel like working on that mundane piece of new functionality? Then spend a couple hours doing code golf and figuring out how to test this four-line async piece of code. Nevermind that the level of abstraction required to do so will add twelve lines and five new parameters to your method and ripple all the way through your architecture. But hey you can still charge the 8 hours for that because "unit tests add value".

IMO unit tests are a business requirement and should be handled as such. Unit tests that go beyond what is required should be deleted, just YAGNI.