Both add weight and are typical indicators of an entry level bicycle, along with stem shifters. So that covers the "weght weenies and "profiling wannabes".
However, as stated, safety levers just do not stop well, unless they are very carefully set-up, something which rarely happens. They lure the casual rider into a false sense of security, often leading to disastrous results in emergency situations. Novices are far better off learning to ride the brake hoods.
As for spoke protectors, they are a legitimate item for entry level bicycles. Riders at this level, especially kids, are prone to dropping or having the bicycle fall on the derailleur. This typically results in a bent hanger and the first time they pull the shifter all the way back for a hill, the chain overshoots the large cog. It's far better to unjam a chain from between the cog and spoke protector than to deal with broken, bent or notched spokes.