Don't get me wrong, I don't see it that way, but that's because I don't think one should enforce specific logic (reasoning pattern) on another set of logic (given ruleset) because that means you try to second guess rules based on hypothesized intent.
Could you clarify this? I'm not sure what "it" it is that you don't see "that way". I also have no idea what the bit about different logics means.
I'm really starting to feel bewildered by this particular facet of the thread. The OP wanted to discuss terminology issues in 4e, specifically ambiguous terms. Someone else commented about ambiguity of the meaning of the word "level", which in 4e is distinctly
non-ambiguous. Are you people all in cahoots?
Let me make an analogy. We talk about a person having a middle-class income, owning a middle-class home or a middle-class car. The use of that term to describe three different things does not introduce ambiguity -- instead, it serves as a semantic link or shortcut. Someone who owns a middle-class car and a middle-class home by implication probably earns a middle-class income. In the same way, a 12th level character wielding 12th level magic items is probably going to be fighting creatures that are at or about 12th level.
In fact, it goes beyond that. Just as someone who lives in a middle-class home and drives a middle-class car but earns less than a middle-class income may be in over his or her head financially (i.e. "something is wrong"), when a 12th level character wielding 12th level magic items is fighting creatures substantially higher level, there may be something wrong!
The guidelines are approximate, of course. In the campaigns I've played, no 12th level character ever had more than one 12th level item, let alone 12th level in every slot, and many encounters featured creatures of higher or lower level. What the character level does in that context is define a broad stripe of levels that the other things should fall within.