Actually, the Expanse portrays how ships can turn and change directions basically perfect. Where it takes liberties is that ships can't turn and change directions as much as they do. The engines and propellant in the Expanse is way way WAY efficient -- probably much more efficient than our physics allows. In the real world, you'd either be manoeuvring with 1,000 times less zest, or having to refuel about 1,000 times more frequently, or some combination of both.

But apart from that, its physics are pretty close to 100%.