Alone the implication that you need a light sabre to train Jedi shows how little you understand about the force.
Why is there so much emphasis on it in tfa then, it’s obviously important to the narrative. I understand how the force works but it’s a jedi’s weapon of choice, how else would they learn how to use it? luke practiced in anh. oh I forgot if your rey you’re instantly sabre and force ready. I wonder why leia never wielded one.