The highest version of ARCore that I can use is 1.6 (core-1.6.0.aar) or else the autofocus doesn't kick in on my Pixel 2 making image targets untrackable. I tried in both Unity 2019.1 and 2019.2 with Vuforia 8.3.8
Autofocus not working on Pixel 2 (Vuforia 8.3.8 ARCore 1.7+)
The functioning of focus modes on a device is solely based upon the OEM's implementation. Vuforia does not have its own implementation, so our APIs call native OS APIs.
If your device support ARCore, then Vuforia Fusion will call ARCore APIs in support of auto focus. If ARCore does not support auto focus on that device, then Vuforia Engine will not support it either.
In addition I've tested with a Pixel XL, ARCore1.7 using the Vuforia core samples and the autofocus works.
Vuforia Engine Support
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