Why should I supplement with protein?

I had my bloodwork values tested again and my protein is still perfect. I have been able to get in only about 40-50 grams of protein a day. The surgeon said whatever I am doing, keep doing it because everything looks great, and ahead of schedule on weight loss (with drinking milk). Some on this site make it sound like it is mandatory to do the shakes/supplements. Is it REALLY necessary? I have been staying away from them because I want to eat like a normal person, and I do. Now I am wondering what is the point in all the supplements. Can someone tell me why they BELIEVE that it is necessary?

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