[KiaMech]

All factory paint jobs have orange peel. The paint on the hood-roof-trunk panels tends to lay down flatter, but all factory paint jobs have orange peel. Aftermarket paint jobs can have orange peel too, but the ability to use more clear helps reduce the effect, not to mention the painting process is entirely different.

You can sand down the factory paint to make it flat then buff it out, but you'd have to be pretty careful.

 

[KiaMech]

Some cars are worse than others, but they all have it. Polishing alone won't take away the orange peel, you have to "cut-and-buff", which is sanding the high spots down with fine sandpaper and buffing it to a shine with a buffer.

You're right that there isn't much paint there. Companies get fined when too many pollutants go into the air. Less paint is a way to avoid it, and save money. You can still cut-and-buff it though, just don't get carried away.