Because the Allagans were justifiably concerned about fake news, and were building records of the lies to teach self-learning bots how to recognise and destroy the falsehoods.
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I could easily see these being canon. For one thing, the "tomestones" may not be actual Tomestones but a smartphone like device BASED on tomestones. Like, I know you can buy phone covers printed to look like a tomestone of poetics. I could imagine them taking Tomestone and the poetic design as inspiration. I always assumed the Tomestones themselves projected a holographic screen, which is why Rowena isn't constantly searching for various devices to play these on. The Ironworks is lead by a Garlean, and they've already breached basic monitor technology with touch screens and everything. The idea that we have a phone and linkpearls also isn't far fetched. Link Pearls are literally the tiny, near invisible, ear phones you see thieves and spies using in stuff and Tomestones like Smartphones. Link Pearls have one purpose and that's to relay voice. But Smartphones can do soooooo much more! I like to think our chat box, tells, etc, are or can be controlled via the tomestone. I could even imagine Link Pearls syncing up like bluetooth to them. For hand's free talking which is turned into text on the tomestone for later reading. Remember all the cute little minigames we can play with the toy chest? I betcha those are playable on a tomestone! And how do you think we can take our screenshots? I imagine it has some kind of holographic camera for getting those scrolled out shots. The reason it says nothing happens when we pull the tomestone out is because we're literally just scrolling down and tapping randomly on the screen. Just literally turning it on and scrolling down and tapping randomly! Of course nothing happens! XD You probably open and close the same app a few times over the course of the few seconds.