I'm going to guess its because they're giving us what we expect, and can make sense of. Most spaceships have big hot engines of the type you'd probably unlikely

I'm going to guess its because they're giving us what we expect, and can make sense of. Most spaceships have big hot engines of the type you'd probably unlikely to see on an actual spaceship, but we've been conditioned to expect big engines, so that's what we get. Also there isn't really time in a film to explain away not needing wipers, so rather than risk having audiences thinking theres bad special effects because the rain that's falling isnt also falling on the windscreen, they just put wipers on and be done with it. It could also be that that futuristic car you saw flying in, and can still see partially in shot is just a bog standard car that they've dressed to look like a flying car.