How great is the threat of vitamin deficiency with the proximal RNY?

I was reading through some old posts this morning when I came across some information on vitamin deficiencies in RNY postops. I read about long-term concerns over iron, B12, calcium and vitamin D. When I had my proximal done it was my understanding that I was at less of a risk for deficiencies because very little of my intestine was bypassed (as compared to malabsorptive procedures). Now Im reading that its not the bypassed intestine that leads to deficiency problems but bypassed lower stomach. In fact one study quoted that 40% of RNY postops experienced vitamin B12 deficiencies (see post Surgery Types - Comparison - Complications of RNY and BPD/DS). Even though Im doing well Im starting to second guess myself and wonder if I should have gotten the DS (which is still a possibility since I have all my parts). On the other hand, I dont want to expose myself to unnecessary risk. Ive been reading up on the DS procedure and it does have its appeal but, as a malabsorptive procedure, doesnt that pose risks of vitamin deficiencies as well? One of the most mentioned benefits of having the DS is that you wont have a problem with dumping and can eat any foods you want but I already CAN eat any foods I want: dairy, sugar, most meats (limiting the fatty red meats) and my weight loss seems to be holding up. My main concern is the long-term dangers. Should I be worried?

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