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Adjusting the side mirrors as C&D described (which I've been doing for 2 decades) doesn't mean you just glance in a side mirror, assume it's safe, then swerve to the next lane. All the driver has to do with the side mirrors aimed further out is lean their head towards the side they want to check while still looking at said side mirror. That creates a sweep of the area adjacent to your car as well as further out, without the need to turn completely around.
If you decide to aim the mirrors towards the side of your car for the motorcycle lane-splitting example, now to check the adjacent lane for cars you have to turn your head around. The C&D described method is clearly quicker and safer - your head remains pointed towards the road so your peripheral vision will still catch action in front of you. The turn to check a blind spot is a very unsafe moment while driving at highway (or higher) speeds.
It's also essentially the way you need to adjust mirrors for racing. Can't physically look for a blind spot with a helmet on. You have to use the side mirrors as I described. HANS type devices have limited head movement even further.
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