Fibre is orders of magnitude better than DSL or cable as entire classes of problems are eliminated. Water shorting out copper pairs? Not a problem unless the water gets inside a splice and freezes causing significant bends that lower signal levels. Water getting into a cable is generally not an issue as most cables are either gell filled or have water blocking tapes. Lightning strikes are generally a non-issue since the cable isn't going to conduct a damaging charge into the ONU/ONT.

With careful selection of the customer ONU/ONT, the incidence of support calls means that it can be weeks between customer issues on smaller networks. These days my biggest support headache is in house wireless coverage. It's also the one part of internet service that most people are unwilling to invest even small amounts of money to improve. The worst are the folks that install outdoor wireless security cameras without thinking ahead to putting them on a dedicated network to avoid driving up airtime usage and congesting the main wireless AP.