And it also lets Kirk be the one in the big fight with Khan instead of Spock. What is the logic in having the hero of the piece be in a coma during the climactic fight?
Because it simply doesn't work. Even in Space Seed
, Khan should've squished Kirk like a bug.
And if they had went that route, many of the people who dislike the film would've went on and on about how Khan should've squished Kirk like a bug.