This is a funny statement. Fracture stability and ability to hold weight depend on much more than just repair confidence, like fracture pattern, quality of bone, etc....
The orthopaedic literature suggests that in the elderly, they are very often unable to "comply" with weight bearing restrictions when asked specifically to perform weightbearing task. So if you are concerned enough about an elderly patient to operate on them to allow mobility to decrease morbidity, you need to make them weight bearing as tolerated. Zuckerman's article in JBJS regarding post-operative weight bearing after femoral neck/intertroch fractures, hammer's home the old orthopaedic adage" "treat them like a dog".
A dog doesn't walk on a broken leg until it stops hurting enough to weight bear, later in its healing stage. Zuckerman showed that elderly patients progressively increase the amount of weight they place on the injured leg voluntarily! They have a built in defense mechanism for surgeon not confident in their reduction or fixation
I know several general surgeons in very rural areas nailing femurs, etc. Its a necessity in some places, and we all know there are very difficult hip fractures, and bread and butter ones. The ability of that surgeon to recognize his limitations and refer to someone else is important!