So i'm thinking that the article is only partially true and partially opinion, this reminds me of the posting on the (i'm paraphrasing here

'complete uselessness of strength training on machines vs. free weights'. So for those of us who do use regularly or occasionally machines for our strength training perhaps it is good to incorporate the abductor exercises into our routine so they at least get worked and those who do free weights or free standing exercises it is mostly likely entirely unnecessary as they are worked through exercises like lunges/squats etc...
but to completely dismiss ab/ductor exercises is idiotic to me. Just like you do different exercise for your abs, for lower, upper and obliques, even though you really exercise the entire muscle its just the muscles fibers on one end or the other get worked harder, I think the same concept could be applied to this debate on the ab/ductors. Really it's like saying don't do any 'lower' abdominal exercises, which I doubt anyone would think was sound advice.
I never really did the ab/d machines cuz it always was uncomfortable to me. I do however add in some low-pulley leg raises (to the side and in) standing next to a low-pulley with a cuff attached to my ankle at a comfortable weight. I can definitely tell those target my inner/outer thing MUSCLE, because they get that wonderful lactic acid ache the next day. I'm not doing it to 'spot reduce' as I figured most people unless they have lived under a rock for the last 20 years know that is impossible! BUT I do it to strengthen my leg muscles so I have more overall power and tone in them.
It is good to know however that proper form in strength training is evolving, just like when they made us do the hurdler stretch in gym class then one year decide it was bad for us and we did the modified-hurdler stretch. Raising awareness on certain methods of exercising/stretching a muscle that can actually cause more damage is really good (like don't do the lat-pull down behind your neck! or don't extend your knee past your toe/ankle when doing lunges!), but you shouldn't make it seem that doing any exercise for that muscle is useless.
I think perhaps that is what is causing most of the confusion in this thread. The article would be more clearer if it had more context.
