Number of speeds makes no difference. I have used 7, 8 and 9 speeds on electric bikes and 10 speed on each of my road bikes. I've never done any adjustment or maintenance to any of my road bikes either. That's about 2200 miles on top of the 10,000 mentioned above. They get the same maintenance as my electric bikes, i.e. a squirt of hypoid 90 gear oil when the chain goes dry. It's a complete fallacy that these things need any significant maintenance for normal road use.