I carry at 4 o'clock. Maybe I am not as flexible as some, but I can't even begin to reach my holster with my left hand. Ok, I just tried and I can touch it when my left hand goes around my back. I do know for a fact that I cannot see it. (remember, 4 level neck fusion) So, I reholster one handed without looking.
Now, that is my concealed carry. Cross Breed Super Tuck or Galco KingTuk depending on the pistola.
However, even both of my comp. rigs (1911 or 625 revolver) which are open carry of course are set where I can draw as fast as posible (2:30-3:00), and when reholstering I am seldom looking at my holster. I have normally just reloaded while watching/looking at my targets and VERY seldom take my eyes off the targets while reholstering because I am planning my next string, reviewing the last etc. I also consider it good training for defense. In competition I may take a quick glance to be sure of my footing in the shooter's box other than that I'm concentrating on targets.

The holster isn't gonna help me survive.
Now, another point . Let's say I have not drawn my Concelaed weapon to shoot someone. I draw mine almost daily so I can go into the Post Office. When I return to my truck I grab my pistol from it's hiding spot and can be looking out the windows as I reholster discretely. I can do it seated or as I enter or as I am exiting the truck. I like having that ability.
I also think it is important.

