It is both a parent problem and a kid problem. If someone uses a leash/harness to safely give a child space, that is very different from using a leash/harness in place of teaching a child safety, boundaries or to follow directions. Or in place of them learning it. It becomes a problem when it is arbitrarily used just because it’s easier. Same goes for videos, babysitters, candy, pacifiers etc.
Please come to my house and show me how to teach a 16 month old anything.