Yeah, you answered your own question. DEN was built as a clean sheet idea in the 90s with the knowledge that it would become a major hub due to geography and population. SLC is where aviation pioneers held airshows. It would only get built in its current location today if there weren't any other options. And only with the knowledge that it could never grow beyond a certain capacity. I think DEN is always in the top ten (worldwide) for aircraft movements, whereas SLC has +/- half the traffic. Plus, a lot more NIMBYs in the 90s.
The departure out of SLC is somewhat complicated, and some flights are probably load limited. DEN is just like any other major US airport (only higher).
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