This is no different from the rope case. A rope can't be severed without their first being a sharp rock. And how was the sharp rock posited? In response to a die roll yielding an unsuccessful result.‘Runes cannot be read without first assigning them a meaning’.
How did they get assigned a meaning? In this case the player selected a meaning, rolled some dice and got a successful result. That’s the part that’s non diegetic that doesn’t occur in d&d. In d&d the player isn’t selecting the meaning of the runes subject to a successful die roll.
As to what you say about D&D, here is a counter-example:
I'm not sure what edition that instance of play is from. Here's a similar (not identical) example from 4e play:"Oh, you failed your arcana check to identify the runes? They're definitely runes of demon summoning, and you've triggered them!"
The player succeeds in a roll to intuit the final argument that will sway the maruts, and thereby wins the skill challenge; and then the player authors the argument. This happened in a D&D game.The PCs erected a magic circle around the Mausoleum of the Raven Queen, in order to prevent anyone from entering it and potentially learning her true name (backstory here); then rested; then scried on the tarrasque, which they knew to have recently begun marauding in the mortal world, identifying its location and noting that it was being observed by maruts.
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The player of the eternal defender had already noted that, when I read out the description of maruts and their contracts earlier in the session, the only being actually mentioned by name was the Raven Queen. So he predicted (more-or-less in line with what I had in mind), that the maruts observing the tarrasque would be there at the behest of the Raven Queen (who is served by three of the five PCs), to stop it being interfered with.
When the PCs then took their Tower to confront the tarrasque, that was indeed what they found. Upon arriving at the tarrasque's location they found the tarrasque being warded by a group of maruts who explained that, in accordance with a contract made with the Raven Queen millenia ago, they were there to ensure the realisation of the end times, and to stop anyone interfering with the tarrasque as an engine of this destruction and a herald of the beginning of the end times and the arrival of the Dusk War.
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I wasn't sure exactly what the players would do here. They could try and fight the maruts, obviously, but I thought the Raven Queen devotees might be hesitant to do so. I had envisaged that the PCs might try to persuade them that the contract was invalid in some way - and this idea was mentioned at the table, together with the related idea of the various exarchs of the Raven Queen in the party trying to lay down the law. In particular I had thought that the paladin of the Raven Queen, who is a Marshall of Letherna (in effect, one of the Raven Queen's most powerful servants), might try to exercise his authority to annual or vary the contract in some fashion.
But instead the argument developed along different lines. What the players did was to persuade the maruts that the time for fulfillment of their contract had not yet arisen, because this visitation of the tarrasque was not yet a sign of the Dusk War. (Mechanically, these were social skill checks, history and religions checks, etc, in a skill challenge to persuade the maruts.)
The player of the Eternal Defender PC made only one action in this skill challenge - explaining that it was not the end times, because he was there to defeat the tarrasque (and got another successful intimidate check, after spending an action point to reroll his initial fail) - before launching himself from the flying tower onto the tarrasque and proceeding to whittle away around 600 of its hit points over two rounds. (There were also two successful out-of-turn attacks from the ranger and the paladin, who were spending their on-turn actions in negotiating with the maruts.)
The invoker/wizard was able to point to this PC's successful solo-ing of the tarrasque as evidence that the tarrasque, at least on this occasion, could not be the harbinger of the end times whom the maruts were contracted to protect, because it clearly lacked the capacity to ravage the world. The maruts agreed with this point - clearly they had misunderstood the timing of celestial events - and the PCs therefore had carte blanche to finish of the tarrasque. (Mechanically, this was the final success in the skill challenge: the player rolled Insight to see what final argument would sway the maruts, knowing that only one success was needed. He succeeded. I invited him to then state the relevant argument.)
D&D is not simply how some posters prefer to play D&D. It encompasses quite a bit of variety.
EDIT: Also, in response to ‘Runes cannot be read without first assigning them a meaning’: this may be true. But a fiction about runes being read can be authored without first assigning them a meaning. That doesn't mean that the reading is not something that occurs in the fiction.