Advantage? Maybe, maybe not. But when Morris says that images from his 1DX appeared to have colour that was 'off' and exhibit 'poor quality' when processed in ACR that's more than lens blurring issues. Much more. Now, maybe Adobe doesn't quite have the processing of 1DX images right, don't know. If so, I'm sure it's something they'll work on. Maybe it's a camera profile issue and a custom profile would work better. Don't know. Has anyone else made mention of poor results processing 1DX images in ACR/LR?
As far as the Canon DLO and DxO lens corrections, Adobe does have its lens profiles. I'm not entirely sure what all goes into those profiles; whether it's simply corrections for things like barrel or pincushion distortion, or whether there's more to it. I'm not entirely sure what Canon means when it talks about addressing blurring caused by the low pass filter. I know what the low pass blur is and how it happens but not what Canon means when it talks about correcting it. Are they talking about applying some automatic measure of capture sharpening? If so, then I'd prefer the manual approach that Adobe offers. The Detail panel in ACR/LR does use deconvolution which does try to reverse the cause of the blurring rather than just enhance edge contrast like USM.