Doing an EVA (Extra Vehicular Activity) is a major undertaking. Because air pressure in the suit tends to make the suit rigid, the lowest possible air pressure is utilized. Thus, the 'camping out' in the airlock overnight to acclimate to the lower pressure. Then there is the suiting up, which takes a couple of hours. Each EVA is carefully choreographed before hand, planned out in detail, so that every moment is used to the best advantage. Each cosmonaut has to be able to talk to his partner, the crew on the station, the crew on the shuttle, (when the shuttle is at the station,) and to ground control, without interference. A limited number of radio channels are available for this purpose. Have you ever noticed that only one person talks to the cosmonauts from the ground? That person must be briefed as to what the EVA entails, and follow along in a binder prepared in advance. So a 7 hour EVA is actually a 10 hour day.
Staying on task without getting disoriented, sightseeing, or sidetracked would be very difficult for one person, I believe, and having a partner also means that there is someone who can see your back. Brushing up against structure can result in damage to the suit, which would be impossible to see or repair for the wearer. Cosmonauts must be tethered to the vehicle at all times, which means that they must be aware of where each others tethers are. Because it is impossible to recognize someone in a space suit, the suits must be color coded for identification. Keeping track of multiple color codes can be confusing, in a situation where confusion must be avoided at all costs.
The day will come when someone can decide that they are going to step out for a bit and fix that flapping shutter, but that day is still many years in the future.