I would never suggest it was stupidity. It's more likely that no one saw the need for a them. Just a few decades ago, almost nobody thought people needed a home computer — let alone one that fits in a shirt pocket.
Priorities drive invention. Most native Americans were at least semi nomadic which means they didn’t really make roads over time. I suspect the travois was just as effective over rough ground as wheels.
After all, I use a wheel barrel here in the yard just fine but I really don’t want to try pushing it through the woods.