For the x-wing banking in space, it could be because that’s how the thrust vectors are lined up. Like maybe it can turn on the y axis (yaw), but it’s much better at turning on the x axis (pitch), so he turns it on the z axis (roll) to line up the x axis with the rotation he really wants to make.

Many space flight sims work this way, though tbf it might be because they are mimicking winged flight characteristics from air-based flight sims.

But I think it does make sense from an engineering and production pov because you can make the yaw mechanism smaller than the pitch mechanism while still being capable of turning in any direction.

Though I gotta wonder how a universe like Star Wars with clearly advanced AIs generally makes them clumsy contraptions and tends to leave flying and aiming ship weapons to humans. It makes sense for the force-sensitive characters, but the millennium falcon should have had a button to press to shoot down all tie fighters in the time it takes the guns to point at where each fighter will be, and the fighters themselves should have been unmanned and shot the falcon from multiple angles before they had a chance to push that button.

It’s not enough to ruin the media IMO, but just amusing to see cool tech in media but also clear signs the writers didn’t realize the full implications of tech like that existing and that nothing exists in a bubble.