"They were interested in quieter, fine motor pursuits too."
It's perfectly possible to engage in both energetic play and enjoy fine motor pursuits in the same day!
As I suggested in my post, they were able to divide up their days between energetic play and fine motor pursuits, and accomplish all of that without venturing outside. Energetic play doesn't require going out. And my DCs' idea of energetic play involved a good deal of make believe to inform the activity - not always easy to sustain when out in the playground with dozens of others waiting for a go on the swings. It's hard to fill in the unavoidable lulls created by others. The garden swingset was a far better hangout for that reason.
For the most part though, my DCs actively preferred fine motor activities. They liked reading, we had some computer games like Monkey Island and Oregon Trail, and early Sims versions that engrossed them, as well as drawing, painting, and jewelry making. Sometimes when we got to the park they stood around bemused.
When they got older they loved their skates and bikes as well as the less physical activities, and they also loved TV.
I disagree that children who are not physically active have their destinies carved in stone. There is a lot more nuance to it than that, lots more factors influencing the outcome.
I suspect that a lot of the criticism of sahps for cultivating couch potatoes is actually a roundabout way of requiring sahps (the majority of whom are women) to justify their existence.