“They aren't having communication breakdowns.”
Now, I've studied a foreign language. I suspect many, if not most, of you have as well. I took Mandarin Chinese for 11 years (ages 11-21), and spent a total of a year, including the entire last academic year of study, in China. By the definitions set by the American Council for the Teaching of Foreign Language, I reached Superior proficiency for reading, writing, and listening, and Advanced High for speaking. This was hard work! Guess what's in the explanation of the Advanced High proficiency level? That's right. Occasional breakdowns that are based in language proficiency. (They don't talk as much about breakdowns that happen for other reasons.)
The next level up, Superior, is supposed to be equivalent to a college educated native speaker in terms of what you can say. (We're not expected to actually sound like one. Accents exist and every culture has its own common expressions.) So. One step down from a college educated native speaker, we're still talking about occasional language proficiency related communication breakdowns. And you want me to believe a K-12 student never has any? Sorry, but no. I don't buy that. I've met kids ever in my life. Heck, I've been a kid ever in my life.
Or. I'm a teacher. Trying to explain new concepts to people is literally my job. Do I use more than just speech to do this? Absolutely. (I presented at this same conference, about AAC in the classroom, for teachers who need AAC.) Do I experience communication breakdowns in the classroom on occasion? Again, absolutely. Of course I do. Students aren't sure what question I'm asking them. I'm not certain what question they're asking me. Communication issues always, always, have at least two sides. It's neither just me nor just them. If a tool can help either side, or both sides, repair the breakdown, still take it.
Besides, can you honestly say no one's ever misunderstood what you were trying to tell them? In the last few days, weeks, months, have you never been misunderstood, or misunderstood someone else? No one even got your coffee order wrong? Really? Because I got asked if I wanted a hamburger, and then got handed a cheeseburger when I said yes. I eat hamburgers, but not cheeseburgers (texture issues.) That's a communication breakdown right there. AAC wasn't required in order to fix it, but it happened.
So. We've established pretty well that I am 100% certain the person making this argument is wrong, not just in their conclusion, but in their premise. I don't think they're lying, but they're incorrect. Their student or client is absolutely experiencing communication breakdowns. Why don't they know?
- Their client or student doesn't have the needed communication access in order to say they're having communication breakdowns. I know, from experience, that if I need to use speech in real time, I'm not going to be able to correct most misunderstandings. It's just not going to happen. So you might not even know there was a misunderstanding. Give me AAC and I have a shot. Which, of course, now means you know there was a problem. That's actually progress!
- They've learned from experience that trying to repair communication breakdowns isn't worth it. Have you ever decided not to address a misunderstanding because you thought it wasn't worth it, or that it wouldn't work anyways? I know I have. And yes, I've done it in an educational context, with points for a class on the line. This past fall, even. In an environment where I had access to AAC and could totally have typed for the conversation. I didn't think it was worth the time or energy it would take, so I let it slide. Imagine that attempts to repair communication breakdowns mostly haven't worked in the past. How often are you going to try, even if the option is available?
Neither of these are reasons to skip the AAC. The first is actually a reason to provide it. The second … AAC won't fix this problem. However, if communication needs not being met was part of why past attempts at correcting misunderstandings didn't work, proper access to communication (likely including AAC) can have an effect on the decision-making process here. That doesn't mean they'll always decide to tell you about misunderstandings. Do you try to correct every misunderstanding you ever encounter? Or do you let some things slide, especially if you don't know someone well or don't trust them to change their mind even given the proper information? Besides, plenty of disabled people have reason to mistrust therapists. We might not want you to have the "correct" information! So providing AAC may or may not lead to you knowing about communication breakdowns when they happen, but if you think there aren't any, that just means you're missing them.
TL;DR: Everyone has communication breakdowns sometimes. If you think your client or student doesn't, that means you're not finding out about them. Maybe they literally can't tell you for communication access reasons, or maybe they've decided it's not worth trying to repair the breakdown. Make AAC available anyways.