Yes, I know that Leia has always been Force-sensitive since The Empire Strikes Back (remember when she sensed that Luke was in danger of falling off of the bottom of Cloud City and she had to rescue him?), but today I’m going to explain why the fact that she is Force-sensitive completely undermines the entire quest to find Luke in The Force Awakens.
In The Last Jedi, Leia is seen seemingly flying in space towards the Resistance flagship, with zero build-up to her being this suddenly powerful Force-user at all. In The Rise of Skywalker,
it is revealed that Leia trained under Luke and built her own lightsaber, and she trained Rey as a Jedi after the events of The Last Jedi.
We all know that when you’re Force-sensitive, you automatically have powers. In fact, we see a kid use the Force to pull a broom at the end of The Last Jedi! Since Leia is Force-sensitive, the Resistance wasted their time and resources looking for Luke, even before he refused to go with Rey. The deaths of Lor San Tekka and Han Solo were pointless. So why did they need Luke Skywalker if Leia was always Force-sensitive?
TL;DR Leia being Force-sensitive, especially in The Empire Strikes Back and Return of the Jedi, undermines everything that happened in The Force Awakens and The Last Jedi because you automatically have powers when you’re Force-sensitive, and the Resistance never thought about needing Leia as the Force-user they’ve been wanting instead of Luke Skywalker.