5

Based on your description, while the technician is not pivotal the story, the main characters' interaction with the technician is important. This new information about the technology and the world informs your readers. I would only have concern if there is an in-depth back story of the technician that does not tell the readers anything about class, culture, ...


2

Who says one off characters aren't relative to the story? Say you have a story where the main character is the head of a company. Several hundred people work for this guy - you're not going to introduce all 351 employees in your story. You might have a handful of characters who routinely interact with your main character - these will be fleshed out ...


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