Tequila Sunrise
Adventurer
I'd be willing to bet my grandmother's grave that no designer will comment here because there's no underlying philosophy to account for the different number of trained skills, or for who has access to which class skills. Other than maybe "it fits the class from certain undefined and subjective idea of class fluff."
If it bothers you, house rule all classes to have the same number of skills; it won't break anything. I myself mostly house rule away class skills.
If it bothers you, house rule all classes to have the same number of skills; it won't break anything. I myself mostly house rule away class skills.