Never done it without a blind.
My thought process is, it's not really turkey hunting if you're ambushing them.
for me, 99% of the fun of turkey hunting is calling them in. I have never found a roost tree...I just have areas where I go where I can hear turkeys gobble on the roost. As long as I can hear them, they can hear my calls. As long as they can hear my calls, I can get them to me.
I've heard people say, it isn't fair being in a blind. Well, to me, fair is 50/50. Meaning it's only fair if I'm killing a turkey half my calling setups. I have made it fair for the turkeys by not only hunting with a bow, but hunting with a stick bow. Meaning I need a Tom inside 10yds before I'll take a shot.
I know guys who will kill a bird 1 out of 4 years and they're hunting with shotguns and 3.5" turkey loads with effective ranges up to 60yds.
Sitting in a blind is incredibly fair.