The main advantage of the omniscient approach is that it's the easiest to handle. That's the major reason so many writers select it.
Sentiment: POSITIVE
It has adopted the geometry most advantageous to the species or, in other words, the most convenient.
Point-of-view is a matter that readers rarely pay attention to, yet it's one of the most important story decisions an author makes.
SF has at least the advantage of not depending on preconceptions.
I always say it takes as much preparation and thought to do a small part as a leading part. In some ways, leads are easier because you have the luxury of time to discover the character.
In mid-20th-century America, it could be argued that the novelist still had the most claim of anyone to omniscience. Whatever he/she couldn't prove, he/she could gesture at.
Why, for example, do the great writers use anticipation instead of surprise? Because surprise is merely an instrument of the unusual, whereas anticipation of a consequence enlarges our understanding of what is happening.
And I think that being able to make people laugh and write a book that's funny makes the information go down a lot easier and it makes it a lot more fun to read, easier to understand, and often stronger. So there's all kinds of advantages to it.
I suppose it's true that most great television, literature, and other forms of high art (and basic cable) benefit from a little hindsight. 'M.A.S.H.' comes to mind. So does 'The Iliad.'
The advantage of writing from experience is that it often provides you with details that you would never think of yourself, no matter how rich your imagination. And specificity in description is something every writer should strive for.
The great advantage of a novel is you can put in whatever comes into your head - it has the same shape as the human brain.