You're right, and I understand that - but you're less likely to get the same result with high temperature, so it will be hard to find correct outputs when using overlap of output.
But combining pieces that look good to you of several outputs is a good way to use it.
Much of the natural language it creates is useful to me as essentially an extended thesaurus, or to make slightly different points I hadn't thought of it emails. It undoubtedly (demonstrably and probably, I'm sure) knows *way* more than any human on Earth, so it's great at teaching people new things. I usually just reword everything slightly that GPTs provide, so it's a *phenomenal* learning tool.