A practical issue is that GPS can be spoofed relatively easily. If autonomous driving became a thing, and ubiquitous, with vehicles that prioritized remote over local consistency, then a single GPS spoof could cause some interesting things to happen. This is probably a concern that does drive decisions, at least to a degree. It creates a weird scenario where you kind of need to trust GPS, but you simultaneously also can't treat it as authoritative.

OTOH creating a dumb user experience for a fairly common scenario, to try to preempt a hypothetical scenario is probably not a great idea. A fun problem to think about, though it may be completely unrelated to this issue.

I do hope self-driving software works out a better system, before it becomes common place. Autopilot has been incorporating GPS in aviation for decades, and it's still surprisingly common to have major problems when a loss of GPS occurs.

The Phenom 300 jet can't fly straight without a valid GPS signal: https://news.ycombinator.com/item?id=12519629

Every swept-wing jet has a tendancy to enter a positive feedback loop of rolling and yawing, called a dutch roll, when flying at altitude, so even when not using autopilot, an active system is needed to fly straight and level. If the Phenom 300 doesn't have a valid GPS signal, that system fails.

If it becomes common place, spoofing is easy to counter. Directionality and parallax of the signal is enough to figure out the true signal, all it requires is an additional antenna.

This won't prevent jamming, that requires a different mechanism, but spoofing should be prevented.