So, can you explain the physics of how a tractor beam works in a small ship or are you just going off what the movies show?
My point is, this upgrade is a device to add a level of game play to a game. Having it so it stops a ship dead for it's next turn is crazy broken AF. You could literally keep a ship on an asteroid whilst your turreted ships kill it dead, without any recourse. Sound like a fun game idea to you? I don't think so either.