This isn’t quite the right concept but… these things are different:

• being dependent on something
• being unpleasantly or destructively limited by something

Being dependent on something can be really good. It can make things possible that weren’t before it. We’re all dependent on technology in one way or another (for instance, heating and air conditioning. Shoes. Large-scale agriculture.).

Sometimes people object to dependence because they think it will impose an unpleasant limitation. Even when it would actually make more things possible. 

Like, someone thinks they (or someone in their care) shouldn’t use a wheelchair because then they’ll only be able to go where a wheelchair can go. They won’t be able to use stairs and such anymore. And sometimes this is true.

But often, this can mean that someone can only go as far as they can walk, and can only stay out for as long as they can stand. So they have trouble leaving the house, or going places for long periods of time. And are much more limited than they otherwise would be. Dependence isn’t bad, if it makes you able to do more things. 

AAC can be like this, too. Verbal speech is more flexible, in principle, all things being equal. But all things aren’t equal, even for people who have some verbal speech. The important thing is for someone to have as much communication as possible. For people who get more communication from relying on things other than speech, dependence isn’t a bad thing. It’s good. It makes life better.

Getting more ability to do stuff you care about should be the goal. Not a particular way of doing it. Not judged against a theoretical ideal. Judged against what actually works best for you (or your child).