Can poor performance relative to one specification always be compensated for by high performance on other specifications If so how can there ever really be a marginally acceptable value for a metric?

Yes, poor performance in one specification can sometimes be compensated by high performance in others, especially in complex systems where trade-offs are common. However, this does not eliminate the need for marginally acceptable values for metrics; these thresholds help ensure a baseline level of performance that is critical for overall functionality. Without such standards, the risk of excessive compromise in key areas could lead to failure or suboptimal outcomes. Thus, while trade-offs exist, maintaining minimum acceptable levels is essential for balance and reliability.