Lightroom/ACR and everything else is reverse-engineered for the Canon RAW format.
Colours, contrast, saturation, everything looks different when converted using software other than DPP. With DPP, what you see on the back of your camera, is /exactly/ what you see on your screen (provided it is calibrated).
Considering the many thousands of dollars that I have spent on my gear, I expect to see on my screen what my thousands of dollars of investment captured, and, not what Adobe/etc think it captured.
Granted, we work on our images in post and take them somewhere else to what they looked like when captured. However, knowing that my baseline is precise to start with gives me immense peace of mind.
Knowing that any change to settings that I make in the camera, will also be reflected /precisely/ in DPP is also a massive boon.
Everyone elses mileage may vary. This is just my own (strong) opinion.
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