but they are offering me nothing.
Your tone screams "Apple is ignoring this problem, refusing to admit there is a problem and will not attempt to fix it" but from what you've said it sounds like they are actively working on a solution and have replaced your MacBook Air multiple times in attempt to make things right. I see that as Apple attempting to help you, along with the other affected users, quite actively. Not as a fanboy or Apple shill, but as someone who reads through the provided information and see's a company attempting to help. In my opinion throwing a lawsuit at a company that is attempting to help (they've replaced your Macs, you're actively talking to someone within engineering, etc) is just bad form. A piece of advice as well, from someone who formerly worked for Apple, the majority of Apple's service chain is advised to stop what they're doing as soon as legal action is mentioned. That doesn't mean Apple will go on the defensive and attempt to screw you, but it will slow things down significantly for you.
These MacBook Airs are the first Apple product to ship with the newly redesigned 802.11ac Airport cards, a new wireless standard that isn't yet widely adopted and in more real world terms, "tried and true" just yet. Perhaps the firmware flashed to either the cards or the Mac's logic boards aren't perfect yet, their engineering team could be running into lots of hurdles trying to find the right combination, leading to an abnormal delay in rolling out a solid fix.
No one is accusing you of hallucinating and no one is saying those with legitimate issues is making it up. Apple has no stake in this forum and likely doesn't scour it all day for feedback. We're end users, just like you, who are here to offer advice or feedback free of charge, on our own time. If we can help you fix something, great! If not, we shouldn't be belittled for attempting to help.