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If you don't provide the full output, you may miss important things that happen during the build. If the information is not logged it is gone because you don't have access to the build environment for introspection afterwards.
When viewing a failed build I usually start by searching for "error" caps insensitively and find what the error is and work back from there. Using this technique, especially searching from the bottom it usually takes only a couple of seconds to find the failure in a log.