There's a lot more in the con than the pro list for turkey decoys. In the pro list, some turkeys are stupid and will fall all over themselves to get to a deke in some situations. It's really cool how those little Chinese gals kill all those gobblers by sending turkey dolls to the US for their volunteers to shoot the bird over.
On the other hand, if you set up where the bird has to come within range of you to see your position, it doesn't matter whether there is a deke there or not because the gobbler wouldn't be able to see it.
Keep in mind when you watch videos that those people are hunting footage, not gobblers. Just calling up a bird isn't the thing. They need it posing out there at close range in good light. All the birds it didn't work on don't matter because they couldn't use that footage. And they're usually trying to sell you something like a turkey doll.