I worked on the system sysco uses for their order guide management, and we had a bug that let anyone order cheesecake factory cheesecakes for a brief moment and that was a red alert issue for us
What about changes that don't cause test failures? A really quick one I can think of is a pure addition. Lets say you have tests for Feature A in 3 places. You add a thing to Feature A, and find 2 places where Feature A is tested, add tests to those, feel like you did your due diligence and move on. Co-located tests would fix this problem
It looks like the poster is the author here, so hopefully he sees this feedback. Please, please, please pick a better contrast ratio for your text. Grey on slightly-lighter-grey is a terrible color combination for reading. I read the first paragraph and gave up on it because it wasn't worth the eye strain.
This isn't always true. Some shows release specials that aren't linked to any season, but go between seasons. Some shows (like web serials) release in one continuous stream. Sure there are workarounds/hacky solutions to these, but assuming all shows have the exact same hierarchy is a bad assumption to make.