Absolute utter nonsense. Not any individuals thoughts but the concept that a spoke being missing is not an issue. A spokes primary job is unchanged by gear count. Dish plays into a wheels overall strength but not an individual spokes task. I will explain and if anyone wants the maths for the actual physics I can post that as well... First the basics.
A spoked wheel is amazing. It transfers at times crazy large forces created by rider, the bicycle itself, and terrain into thin rods, EACH being SYSTEMATICALLY compressed as the wheel spins and the load transfers from one spoke to another and so on and forth spinning and going... A beautiful way to balance weight, cost and efficiency.
Once a wheel is built, centred, trued and tensioned, spokes under tension, basically brace the rim with the hub being used as a central anchor. When built proper and with equal tension EACH and EVERY spoke will distribute the load (work) evenly, while at the same moment keeping the rim circular. Spokes as a team support the wheel, preventing lateral flex and deformaties to the rim. All the while EACH spoke takes a turn resisting vertical loading from squashing the entire wheel. This is not a small task or minor event. The load is often well beyond what one would expect and most would imagine. A wheel beneath a 100 lb rider under certain riding conditions can have the effective load equal to the weight of a non moving small car being placed on top of the wheel. Yes, bike wheels will easily support the non moving weight of a Prius. Load them up under acceleration or cornering and failure is imminent. All the same under you in a pair, with EACH spoke sharing the task and taking a turn at it, things spin on.
This is a topic I could write for hours or days on. In essence a missing or broken spoke is the quickest way to break other spokes and wobble a rim. As during rotation at a point the spoke which is not there is supposed to be taking a turn at baring the load. A repair job in which removing the tire and tube is the most time consuming part (installing a new spoke is not difficult or time consuming)... being dismissed as not necessary because the wheel has yet to fail is silliness. Pure silliness. In my mind 10 or 1 or 20 gears is absolutely irrelevant to the convo. The spoke taking it's turn of supporting the load is not dependent on gearing. Not to mentioned a single speed is at times mashed more because of lack of gear options than a geared bike, an event putting more load on spokes.
Replace broken or missing spokes, keep them tensioned equally. Spokes are less expensive than wheels. They have among the most difficult task on your bicycle and always bare the load.