One problem with the "CORRECT" way is that it can restrict blood circulation in the hand and it can depress nerves in the 'heel' (ulnar metacarpal area) and at the base of the thumb. At least it does so for me after a few days.
Also, in very cold winter conditions when wearing over mittens it is a royal flying purple pain in the ass to get hands into and out of the straps, and I find that my hands are warmer (see above re blood circulation) when using the 'hanging from the wrist' technique.
The correct answer is: Know and understand all the options, experiment for yourself, and figure out what works for you.