In the Driver spec tree, All-Terrain Driver is a 5-point talent which prevents the character from suffering penalties for driving through difficult terrain. My question is: does the later ranked talent Skilled Jockey, which removes one setback/rank, become redundant for characters who are mostly piloting ground-based vehicles (SJ also works on space vehicles)?

Granted, there are other setbacks that could occur when piloting (damaged machine, lighting, etc.), but the biggest one I would expect would be terrain.

No it only lets you ignore the setbacks from Table 7-15 on page 265 AoR.

You can still have a lot of black dice from other stuff.

Edit: Space Jockey works for both piloting skills.

In the Driver spec tree, All-Terrain Driver is a 5-point talent which prevents the character from suffering penalties for driving through difficult terrain. My question is: does the later ranked talent Skilled Jockey, which removes one setback/rank, become redundant for characters who are mostly piloting ground-based vehicles (SJ also works on space vehicles)?

Granted, there are other setbacks that could occur when piloting (damaged machine, lighting, etc.), but the biggest one I would expect would be terrain.

There's another common source of black dice, negative handling. A skilled jockey can fly a freighter like a fighter.

Good point. I was looking at the tree primarily from the point of view of a swoop jockey or podracer pilot (though I wouldn't be surprised if some of the pods had a negative handling modifer, too). There's also darkness or environmental factors, or the actions of other racers, etc.