Yes you are correct being circumcised would give you more friction but the problem is that it is all the friction all the time. There is no way to control it. After prolonged sex my wife would sometimes be sore for as long as 2 days afterward. As you said now you can control tha amount of friction by holding the foreskin back but after circumcision all that control is gone. also sensitivity continues to decrease for many years after being cut because the head is constantly exposed all the time and slowly grows a layer of callus over time and after many years it slowly gets thicker and sensitivity continues to decrese.
Being uncut you can control how much the head is exposed by holding the foreskin back or changing the length or position of stroke. Before foreskin restoration I had little control of when I would cum but now I have the ability to last a long time or to cum quickly. There is now a lot more contact between the entire length of the shaft and the vigina that my wife finds very nice. In the in stroke the foreskin is retracted forming sort of a fluffy padding on the shaft that sort of hugs and conforms to the shape of my wifes vigina and that sensation is very pleasurable for both of us. Also now I can control how much the head is exposed and how often the foreskin jumps over the edge of the head by changing the length or position of stroke and have quite a variety of sensations. I also find that now after foreskin restoration I can much better control when I cum, I can last a long time or sort of cum at will almost. Before I restored my foreskin sex was great but it is soo much better now that I have more control, a greater variety of sensations and much more sensitivity due to the fact that I have shed the layer of callus that once covered my head and inner foreskin. Although sex was great when I was tightly circumcised to look back now after foreskin restoration it was almost boring in compairsion.