Clicker training was invented by dolphin trainers. It wasn't until the mid-1950's that Keller Breland invented marine mammal training. Nope, there are limits. Dogs have instinctive behaviors that are not fully controllable by any form of conditioning. The idea that clicker training can accomplish anything, is usually the wishful thinking of someone with limited experience.
Food is a great tool for many situations, but has some obvious limitations.
The tendency to rely on food exclusively ignores the fact that no single reinforcer can keep a dog motivated at all times. You can't teach classes with clickers because all those clickers will confuse the dogs. Dogs have better hearing that we do, and they quickly learn to listen for their owner's click, while ignoring all others. A clicker is a bad training tool, because you can't take it into the ring. Going into the ring with a clicker is like walking out of the bathroom at a gala event with toilet paper stuck to your shoe.