I agree because, i dont think a simple walk around the neighborhood is not to much exercise on a daily. Exercise is important to dogs' mental and physical health. Also another reason would be because according to (ASPCA) "dogs that dont get exercise can act out at home by barking or destroying things at home.
Socializing is important too. If a dog doesn't learn to get along with others, it may attack a strange dog or person. I know this by exprience. When NYC started allowing dogs off-leash parks dog bite reports went from 40,000 to under 4,000 per year. Bad behavior caused by dogs being lonely or poorly