Sure folks still teach "pelvic" shots. The problem is that they don't teach anatomy and many don't know the anatomy or biomechanics of the human pelvis. I just love it when an instructor says, "And you shoot them in the pelvis and it breaks their hip..." as he presses his hand against a hip bone above either of his front pants pockets. The problem is, the part of the hip being illustrated is NOT part of the locomotion load bearing aspects of the pelvis. Instead, it is simply a hard attachment for connective tissue of the organs and abdomen. The bone touched is the blade of the ilium. It can suffer a lot of damage without the pelvic structure collapsing or 'breaking' in a manner that physically impedes locomotion.
You may shoot somebody or see somebody shot in the area of the pelvis. The pelvis may or may not get hit and you will likely see the person go down. They will likely be in pain and may or may not immediately get up. Most probably will not. They won't necessarily be incapacitated, but they will be in a lot of pain and movement will hurt. Similarly, a shot to the stomach/gut can produce the same sort of result. The reaction of going down that is often interpretted as a failure of the pelvis from being shot is more of a physciological response. Heck, people can get shot in the elbow and still go down as part of the physiological response.
The problem, of course, with such shots is that they are not as likely to incapacitate. They may stop a person from moving about geographically, but not stop them from doing things like firing from their position where they are down. Of course, that is not why people shoot for the pelvis, to incapacitate, but to preclude movement.
If you think about it, as a target, the "pelvis" area is great. It is sort of like the center mass of the human body's locomotive power plant. There is a good bit of mass in the thighs and while the thighs are not ideal targets, they are a helluva lot easier than trying to shoot knees or ankles. There is big muscle, bone, and fat on the the thighs. Soft tissue injuries may or may not impede locomotion. Hell, a LAPD officer shot in the femur during the North Hollywood Bank Robbery incident managed to run some distance with the broken femur and get to cover behind a tree. He didn't move around any more after that, but he was not immdiately stopped and he most definitely was not immediatedly incapacitatd.
A low center frontal pelvic area shot will ideally produce a hit to the pubic bones and also damage the urinary tract of the person shot. Recovery will suck. Slightly higher could produce lower GI and lower abdominal muscle damage - lots of pain and not much recovery fun with the accessory bags the folks will carry around. Left and Right of the pubic shot may produce the desired hits on the critical socket areas of the pelvis. High of those shot, more GI, kidney sorts of damage. Higher still is more GI spleen, etc. None will be fun, but little of the area is going to produce any sort of counted on immediate incapacitation.