If you don't know how to operate your equipment properly, maybe you shouldn't be using it. If you do, don't be surprised when it doesn't behave as you expect.
I personally DO know how to operate my equipment properly. I am not up in arms over this because it affects me personally, but because people who don't know any better.
As I said in an earlier post, my wifi is secured and hidden. Does that mean someone couldn't sniff the traffic coming from it and decrypt it? Of course not. Would it make it harder to do? Sure.
In your analogy, you're saying that if you connect to a web server and get a response, it's reasonable to assume you have permission to use that web server. Sure. But what if you do port scans and find an obscure port "reserved" for something other than http or https traffic and connect that way? Are you headed down a slippery slope there or is it just fine, even if the owner of the web server didn't intend for you to connect to that port?
(I'm just asking, I really don't have a horse in this race.)