Tests are less useful on features that may be canceled soon. Tests are more valuable on more complex codebases. Local tests (shifting left) is more valuable w

Tests are less useful on features that may be canceled soon. Tests are more valuable on more complex codebases. Local tests (shifting left) is more valuable when deploying is hard/infrequent and screwing up prod has higher stakes. These factors explain why most startups should code differently than big corps.