Currently ART is the only OSS raw processor that supports the GainMap (lens shading map) included in dngs from the Pixel and other phones. RawTherapee, darktable, etc, do not support it yet. When it’s included in the dng file and is not a no-op, it’s very important to apply it because it’s not just vignetting but it affects each color channel differently. So if it’s not applied the colors can be correct in the exact center of the image and there’s a heavy color cast closer to the edge.
The example in this thread shows how incorrect the colors can be when the GainMap is not applied. In that case it was mistaken for an incorrect color profile.