[foo_barrio]

This is a good point! We've gotten some instances of Chesterson's Fence that some devs casually remove during a "test refactor" that later allowed a regression to make it into prod.

I've caught some errors in "test refactoring" from our multiple levels of testing having large overlap with teach other. Our end-to-end tests have a lot of overlap with the integration tests which in turn have a large overlap with unit testing. The unit tests run in a matter of seconds compared to the end-to-end which can take minutes or in some cases hours for our manual testing so the levels of testing also serve as an efficiency for us.