Although I agree with you in general, integration tests that are really focused on the contract between two services can be pretty easy to debug, ESPECIALLY if you use request ids that are passed between services, and included in every log. It’s often a matter of simply searching for the request id in your logs and quickly seeing what happened.

E2E UI tests are definitely hard to debug though, in most cases. They still have value, but I’m a fan of the “testing pyramid” here. A small number of E2E UI tests, a decently large number of integration tests that each try to test a single contract between 2 services, and a tonne of unit tests to cover sad paths, detailed behaviour, etc.