Obviously in real life, aerodynamics and size does not matter in space, but in Star Trek, it does. Artistic license helps convey a sense of scale to the audience. Large capital ships and Borg cubes move slowly while engaged in battle. Small ships, fighters, and shuttles move quickly. The point of this argument was that in the modern Treks, they've forgotten this, so every starship, no matter how big or how small, can whizz around at breakneck speeds.