Obviously at SOME point, a collision would be unavoidable (for example recent horrific LA accident was unavoidable for most of those people). But the idea is to be WAY down the distribution. And also, in a simple low traffic density situation, many humans would likely detect someone coming at 100mph in time, assuming they were actually visible.
The same fundamental idea applies though - there’s a big benefit to completing exposed maneuvers QUICKLY, since it reduces risk due to misjudgment of oncoming vehicle speed. And it lowers the requirement on required visual range (measured in time).
It’s something we don’t yet see happening in the apparent testing of 10.69; the vehicle is quite slow and lacks assertiveness which increases risk.