I commute on a bike with a Shimano Nexus, and I feel I should push back a little on the greatness of internal hubs. You have to change the oil in the hub once

I commute on a bike with a Shimano Nexus, and I feel I should push back a little on the greatness of internal hubs. You have to change the oil in the hub once a year or every five thousand km. The OEM oil costs seventy dollars a quart, but some people say ATF works fine. A bike shop will do it for you for forty or fifty dollars. If you use chain drive, the chain will stretch. This is largely invisible on a derailleur bike, since it has an automatic chain tensioner, but on a gear hub bike it has to be done manually, by moving the wheel backwards a couple millimetres in the frame. This takes two wrenches and ten minutes, and must be done monthly or biweekly, or else the chain will fall off when you hit a bump. (Ask me how I know) Belt drive and shaft drive bikes do exist but I have never seen them in person. For the first year of my bike's life I used a Hebie Chainglider: a plastic slimline chaincase that rides directly on the chain. It didn't seem to do anything at all, after twelve months the chain passed 0.75% stretch, so both the chain and the chaincase went in the trash. A conventional Dutch-style chaincase might work better, but I'm not confident.