Fix it, with the Dialog Doctor!

Some more thoughts about Star Wars, The Force Awakens.
I dont know, why the screen writers did not, spend more time in giving the caracters more depth and backgrund, by using some better dialog lines. You can explain so much, if you set them in on the right moment.
Example – Finn:
He just turned his mind, from one moment to the other, even he was teached by the First Order to act like a Stormtrooper. That was a problem for me, to follow.
Why dont give him an interesting history, just by using some lines. Here we go…

Scene: Kylo Ren finished his interrogation at Poe and appear on the Finalizers Bridge, to meet Hux and Capt. Phasma. After he tells Hux, what he find out, Phasma join the Talk.

Phasma: There was a Problem with a Stormtrooper.
Kylo Ren: FN – Row?
Phasma: FN-2187
Hux: Again?
Kylo Ren: seems you still have to fix that problem, with these FNs, Hux.
Phasma: I ordered FN-2187 to Report in, at the Reconditioning Center.
Hux: Set him under arrest. I order his execution.

Or Kylo Ren vs. Rey, during the Lightsaber fight. There is only one Line what could have explained a lot.

Kylo Ren: There ist more in you. Someone made you forget. But i awake a Part of it when i touched your Mind. You Need a teacher ….

And there are more things they could have fixed in The Force Awakens, to avoid questions.

Plot about Rey, Jakku and her skills, against Kylo Ren.

These are my thoughts, about Reys past, how she get to Jakku and why she is such a good fighter.
I think, that Luke trained her in his Jedi school, till it turns out, that she is incredible powerful, that even Luke may have many problems, to lead her on the right way. Even more than he noticed, that other eyes turn on her. Maybe Kylo Ren sensed, that something unusual happened. So he show up at the Jedi School/Temple and search for him/her – whoever – while killing all the young Jedi.
Before that happened, Luke took Rey to Jakku, for her own sake, on a Place what is so far from the galactic Playground, that she is out of sight. Ordering Reys parents, to leave her Doughter forever (What i think is a great Star Wars Moment, close to a greek Myth or a nordic Saga). He may advice Unkar Plutt by using a Jedi Mind Trick, to take Rey to Lor San Tekka. After its done, Plutt forget what he was ordernd too. So Reys Tracks are really vanished in the Sand. Lor San Tekka is adviced to take care of her and show her some lessons in using the Force, without the Jedi Teachings, to prevent her of falling into the dark. On a certain Point, Lor San decides to erase some areas of Reys mind, because she grow too fast and strong in the Force. I think, that this could be a good Plot, to explain why she fight successfully against Kylo. It offers the Opportunity, that he may have something awaken in her, by his poor try, to manipulate her brain, at Starkiller Base.