Part of it is the explicitness mandated by the language (i.e. when dealing with Optionals or Results, you have to deal with both cases or explicitly state which

Part of it is the explicitness mandated by the language (i.e. when dealing with Optionals or Results, you have to deal with both cases or explicitly state which you expect as an invariant). There's also curious (imo) choices on the part of rustfmt that seems to favor density of code that way.