Your last point is the one that I find most compelling.
Humans are autonomous, distributed, and adaptable. In a package that weighs ~150 lbs, with very low energy requirements.
You literally cannot wipe them out without a sustained and incredibly expensive ground campaign, and even then it's not likely.
AI in a data center on the other hand... So easily disabled.
I can easily imagine, say, Russia destroying a few datacenters not with nuclear missiles, but with some relatively trivial local ground-based FPV attack or whatever.
And voila. No cargo moved, no code changes or fixes, no medical diagnosis made,etc. A whole country is disabled.