I have long legs, long arms and a short torso. I also wear my belt on my waist where it belongs.
If I wear a straight drop holster, I have to bend my elbow unnaturally to get the muzzle to clear the holster. A forward cant allows me to bend my elbow less and make a more natural draw.
To a much greater extent than most mechanical devices, firearms are terribly unforgiving of any overconfidence, complacency or negligence.