I'm wondering why you think nerves are connected but the organs involved in the immune system are not? One connection of those organs are the T-cells that kill antigenes, another would be the blood that is used to distribute information and other things the immune system needs.
Nerves are connected in a similar way because two nerves do not communicate directly, they send chemicals to one another. Your picture doesn't show anything relevant, it's about as usless to show "connection" as the example of left and right leg being connected via bones and muscles. In the same way all our organs are connected via bones and muscles.
Then the skin is what keeps the organs connected, or the blood, or the nerve system, the bones, the muslces, what are you still arguing about?
And there is nothing wrong with it.
The problem here is that a system is a linguistic construct defined by man, not a natural ocurrence to be observed. So you either have to show how the immune system doesn't fit our definition of a system or state how your definition of a system differs, in which case it's a matter of taste and your attempt to force your definition through against a long-established consensus is just weird. Especially since your definition of a "connection" as required between the parts of a system appears incredibly arbirtrary to me.
The other option is that what you see as part of the immune system is different from what I meant. For example you mentioned the skin, which I would define as the "wider immune system" whereas I was referring to the narrower definition of immune system, i.e. the parts that actually react to intruders, that is the T-cells, which are the ones that identify and attack things and are responsible for the false alarms that cause allergies as I said.
So you were really jumping head first into a joke to throw "science" around without giving any second thought to what I was referring to or how to actually approach the subject scientifically, which would be to define what you mean with the words you use instead of wildly pitting definitions against one another as though either of them were a god-given constant.
I'm really not interested in following that any further though, it gets boring quickly...
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