I can see what you mean 1day. I really do I kinda feel that way about parents who use strollers. Sounds weird I know. But I think many parents use them because its easier then holding their child. It then see parents give their kids a bottle of whatever while strolling through the mall. I keep thinking "MY GOD Pick up your child already!!" but then I remember, hey maybe they have been holding them for the last 2 hours and their backs are sore. Its hard to know. I don't use strollers and don't plan to either. I mean they have their purpose I suppose but many parents use them all the time instead of letting thier child walk or be held.
Same with the leash (harness to be pc) some parents may use it because they are lazy, but I can tell you when I use it (though rarely) its not because I am lazy, its because of the type of child I have. My dd is so very independent, she won't sit in a stroller (never has hence why we don't use them) she doesn't want to be held, to ride in a cart, she wants to walk, and God forbid she holds your hand!! She has not wanted to do that often since she was 11 months old and learned to walk away lol. She wants to walk next to me, and not far. She doens't typically try to run away from you and will come to you very quickly (most of the time lol) when you call her. But in crowds like the zoo of whatever, the leash is just an added security that she won't get pulled away from me. Ya know?
hope that makes some sense, its late and I am off to bed in a few