Assuming a comprehensive tour of the park - around 19 attractions - and arriving at official park opening, many guests would head for 7DMT first.
The software doesn't think that's optimal strategy - it would probably schedule 7DMT for late afternoon or early evening. The software would probably use the early morning for some combination of Jungle Cruise/Pirates/BTMRR/Splash, or Tomorrowland/Storybook Circus.
None of those lines, by themselves, is likely to peak as high as 7DMT's. But the cumulative time savings of getting those rides out of the way early will surpass whatever the difference in waits in at 7DMT. And that assumes 7DMT's waits in the afternoon will be higher than in the morning,
which probably isn't the case.