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To add some practical experience.
One of my observing spots at home has power lines in view and I am dead sure I have tracked across them in my time. I have never noticed a difference in the view at the eyepiece. I would not worry about them too much from that perspective.
If it concerns you, maybe find yourself somewhere to observe one night which has power lines overhead and check it out for yourself by deliberately observing through them. If you can't pick it or can live with anything you can pick then that would be a pretty good answer for your question.
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