Yeah this sounds strange to me - every drive thru has had an intercom system like this working outside for decades. Doesn't seem like an insurmountable challenge to me.
You're not entirely wrong, but often these AI systems need some pretty clear audio to work. It's kinda shocking how good we are at working around bad audio when it comes to conversation, and I'm certain most people know how bad these intercom systems get. The issue isn't that they need to be fixed at all, it's how far they can go before they must be fixed. And the one thing we can do that AI can't is have face-to-face conversations. If the speaker simply doesn't work, it's a bit of a drag, but you can just pull up to the window directly and skip the entire audio system. Or just walk inside. Both options eliminate the problem hardware, where as AI would need additional hardware to do those jobs.