Exactly, decoys are no different than other hunting "technic/strategy", call it what you will. It's used to try and increase the odds in the hunters favor. Either when you read the conditions as just right to apply them, or not. Or in an to attempt to change up the way things are going where a negative result is not going to change to outcome much anyway (a what have you got to loose situation).They are a crapshoot. In woods they tend to spook deer. In an open field, it can draw in a deer from a long distance out of curiosity. I don't use mine during the rut in the woods anymore. I'll use early season to distract deer when I'm hunting out of a ground blind.
Not any different than rattling. Does rattling work? Sure it does, been proven many times. I've been successful at it myself. Does work every time? Of course not. At times it can do more harm than good in terms of odds at success.
I carry my rattling antlers with me from the first day of bow season in Sept until the last day of gun season in Dec. But I may
It can be comparable to turkey hunting. When the bird is working your way like you want, the best strategy is set still and do absolutely nothing. If not, then you might try a different strategy, one based on how you read the current situation in relation to your personal experiences.