My beagle can do all those things too. Ring a bell for potty, cuddle, learn commands etc. Beagles are naturally stubborn animals but they can learn to do tricks and behave.
Dogs in general can be trained. I doubt anyone said you couldn't train a dog.
The problem is the "hybrid" itself. The problem is NOT the dog but the concept of intentionally mixing 2 dogs and coming up with a fancy name and an even bigger price tag. Puggles are found all across America in shelters. You save a life by going to the shelter rather than padding some unethical "breeders" pocket. If you choose to pad someone elses pocket that's YOUR choice. Personally I would rather pay a $100 adoption fee and keep the extra few hundred dollars for other things. But that is just me. If you have a few hundred to throw away then you are lucky. I personally don't like to waste money. It's the same dog whether it's at a shelter or a "breeders" home. A mix dog is a mix dog- no fancy name is going to change that. There is nothing wrong with mixed breeds only "hybrid" breeds.
To me, Cody is a mix breed. When people ask us what type of dog he is we reply, "he is our little 1/2 breed, 1/2 Bichon Frise, 1/2 Westie. We do not give him a fancy name, except once or twice when the people inquiring about him would not accept what we were telling them so my husband said to those"ok, he is a bestie!" They went away happy and we went away smiling and laughing to ourselves. The ad in the paper didn't give them a cute name, it said Bichon/Westie mix.