It seems to always be newish SUVs from US manufacturers.

I don’t know where you’re at, but it’s always Japanese and Korean cars here. Pretty much everything made by the big-3 has automatic headlights at this point.

So they hand made a few, let some reviewers drive it, then decided to not build it.

That’s not even close to true. They delayed building them at Orion Assembly. They’ve been building Silverado EVs at Factory Zero for several months and made the first deliveries to fleet customers in October.