Darth Sidious (emperor) tried getting those secrets from him and killed him. Tho he didnt manage to get those secrets.
Fan theory goes that his experimenting with these powers caused the Force to react and spawned Anakin.
The livegiving wasn't so farfetched, it was established before, but they certainly underplayed its importance.
What is, is when the Emperor gets fullpower again (unlimited powahhh) because he steals this lifegiving power (?!?) from Rey and Ben (they are linked) to restore himself (his initial plan was the same with Luke, to get striked down and let them take his place).
And then starts shooting force lightning at the Rebel Armada, knocking them out of the sky... That was ...really ... wtf... It really became fullblown space magic at that point. Oh right, and Finn is Force Sensitive too apparantly (because he feels Rey "dying") They just started throwing it around because "its cool" not because it makes sense