Dog Lovers Who Use Clickers: Do you feel like your dog is just a robot slave for food?

I’ve seen some people train their dogs the harsh way (example: smacking, strict discipline and their dogs have turned out really loyal and steadfast to commands). How is this negative? Furthermore, is too much clicking bad? I mean, from what I’ve read there has to be treats everywhere! What happened to just mans best friend being obedient? Please don’t take this the wrong way I’m merely curious about the contrast between treating a dog for every single aspect versus getting a point across with physical discipline. Also, when doing treats, as I do, will I have to do this the rest of my life? It seems like one of my older dogs only comes on command when there is a bag sound raveling. I try to be the most exciting thing around when I call my dogs, I use a high friendly voice as well. Also I have a problem with my puppy at the moment where she is not walking with a leash at all (3 months).