dieing exits with a non-zero exit status and so will be caught by Test::Harness. But it is possible, if unlikely, for a test to exit early in such a way that without a plan Test::Harness won't notice the problem.
I always use a plan more because I want to notice when a different number of tests gets run, such as due to a bug I've introduced into the *.t file or a loop not running the same number of iterations.
Not that I get this whole "ok 6" idea for a test suite. I'd rather output results, include the correct output, and assert that the generated output matches the correct output.
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