Longboards weigh like 689g (1.5lbs)...that’s a lot! “Next to nothing”-type weight would be Ass Saver’s Mudder Mini/Fender Bendor combo, which weighs 71g.

But yeah, every fender has its place. I run Planet Bike Hardcores on the Buzz, where they’ve been for a dozen years or more, and they mount up the same traditional way, bolted to the dropouts and bridge, as the Longboards, and I love ‘em. Those weigh 507g, by the way, but I wouldn’t recommend that type for frequent on/off. Seasonally, yeah, maybe, but there are definitely more convenient, lighter, and tool-less options.

How much coverage one needs depends on the use scenario. For example, foot protection from a long front fender is great if you commute in work clothes, but far less important for a sport ride, particularly with shoe covers.