Reading Maggie's description of what thinkamancy "looks" like gave me a mental image of MK thinkamancers as HAM radio operators sitting around in a room together, monitoring different radio bands for certain activity. Like those HAM radio operators, who all seem to have specialized equipment and the nerdy expertise to use it, the thinkamancers would have access to all the "bands" anyone else does, but actually be able to identify and tune to each band, unlike everyone else.
For instance, if I were to listen to the radio, I'd have to turn the dial around until I came a cross an audible signal, then try to fine-tune it to the best frequency nearby to understand what I was hearing. A Ham operator would possibly hear the same frequencies as I, but be able to interpret what was happening in the "static" frequncies that I quickly dialed past. So, taking it a bit further, audible speech heard by those in the vicinity would be the "good stations" one might turn to automatically, by-passing the "static" stations as being "blank", whereas a thinkamancer could "hear" the static and understand it, because they are thought patterns rather than audible patterns, and only they have the equipment to "hear" it. Just as some HAM operators are more proficient at tuning than others, Master-class would be better at it than Adept-class, etc.
This would fit well with the explanation of "strings" they tune to, as well as giving an extra dimension to the notorious "G-String" reference. Of course the G-string is funny as the reference to skimpy underclothing, but the G-string of a guitar (or other stringed instrument) tends to be the one considered a nightmare to keep in tune with the other notes, always sharper or flatter than the other notes. Kind of like sentient beings tend to easily fight themselves out of being in harmony with the rest of the chord of the Universe.
I hope the last Arkentool isn't the ArkenTuningFork, because wouldn't that be the thing that keeps dragging that pesky Free Will thing out of the way to make things more harmonious? I mean, the Titans already look like the King of Rock and Roll as it is!
Anyhow, in my analogy, Charlie would be the FCC, perhaps, monitoring everything over the waves (selectively, of course), and coming down like a hammer on the "independent" guys who sit out there with their HAM broadcasts, the second they start looking like any kind of serious threat to their authority. An integral and unavoidable part of the system for a good chunk of the world, but definitely NOT part of the community as anything other than an obstacle. Something that those who do it for "love of the game" specifically go out of their way to flout and undermine whenever possible, but only in the subtle and sneaky ways that won't get them caught and punished. The FCC may have the best equipment and best funding, like Charlie and his Arkendish, but they can't truly "Rule the Airwaves" any more than Charlie could rule Thought. He may hack a Thinkagram, but he can't hack a person's mind, necessarily...but only because he doesn't have the subtle, intuitive knowledge that a true Thinkamancer would have.