Rocket equation notwithstanding, there is the tyranny of development. Electric motors, rocket engines, ion thrusters… All of these locomotive technologies went through iterations. Even if alien scientist invented a warp drive capable of carrying an infinite amount of mass an infinite distance with no energy, there would still be a development process to implement and integrate that drive into a spaceship.

Technological progress, or the accumulation of knowledge does not happen overnight, it’s built layer by layer.