Perfect. Let the players run with it. The more impractical and overcomplicated it is the more opportunities for the DM to set up unintended consequences.
The NPC decides to expand the sending stone services without the players' knowledge. They outsource the switching tasks, and then the production and distribution of sending stones, eventually turning it into a full-blown telecommunications service and call center. The players call in and have to wait in a hold queue for assistance. The outsourced staff don't know the player characters and don't really understand or care about the service beyond the specific task they were hired for, so it starts to degrade and provide a worse user experience. A local bad guy hacks into the system and starts eavesdropping on calls. The original NPC sells the business off before it completely collapses, and skips town. Communications failures and chaos ensue.
You know, an inexperienced switchboard operator could easily make the wrong connection, especially in a stressful moment...
I was just saying LibreWolf is Firefox sans Mozilla
It's not though, unless they're building their own engine.
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