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We know Yoda said in The Empire Strikes Back that "size matters not", but in reality we all know that powers and abilities in roleplaying games do scale with size. In virtually any game system you'll find that levitating a ship is more difficult or requires a greater power level than levitating a rock. And there's a good reason for this.
In a game, you need limits on PC power, and room for growth and improvement over time. One of the simplest and most intuitive ways of achieving this is to scale abilities by what they can achieve. At low levels you throw fireballs for less damage than you can at higher levels. You can charm more targets for longer times at higher levels. You can levitate bigger, heavier things as you gain experience and levels.
Even despite Yoda's insistence in the movie, Luke can levitate rocks and fails with the X-wing. He obviously still has things to learn and improve.
Yoda would probably make a really annoying Game Master.
Commentary by memnarch (who has not seen the movie)
I guess that white spot is the bridge then. Still too obvious a target though, but maybe the wire-frame display is a scanning system as well as targeting. If there's the ability to remotely scan for life-forms, remotely analyzing a ship for weak points or at least large groups of people should be just as easy.
What's really curious here is the focus on the button releasing. Reverse pushing? Hand-and-button interaction. Kylo doesn't seem the type to have problems killing, so maybe there's something to Leia's Force Manipulating? It feels like a good moment to have small panels for in the comic, but that also means the movie thought it useful as a story moment or a visual display. And as a gloved hand isn't the most interesting thing to look at, that'd just leave a story moment like that, right?
Transcript
Leia: I summon all my potential to Force Manipulate the attack.
Kylo Ren: You don’t have the power to stop my ship or the missiles!
Leia: All I need is to move your thumb off the trigger...
GM: Oooh. Roll, Annie.
Leia: 17.
Kylo Ren: Force Resistance! Ugh. 9. {Kylo’s thumb moves off his weapon trigger button}
Kylo Ren: Still. Everything is proceeding as I have foreseen. While you were concentrating on me...
Kylo Ren: There’s a reason I have wingmen. They fire!
[SFX]: pow! pow!
[SFX]: Whoosh...
[SFX]: Whoosh... {missiles head directly for the bridge of the Raddus}
Admiral Ackbar: It’s a tra—
[SFX]: KA-BOOM! {bridge blows up around Ackbar and Leia}