How does adding manuals and parts make something LESS repairable? At worst you are no better off than you started.
And for all the crap apple gets for things like their batteries, I used to do fleet battery stuff on dell machines using a third party providers and the rate at which these machines BURNED through batteries was insane. THis was a while back, and not sure if it was the chargers, or how they were used (plugged in a lot of deep drained a lot), but for whatever reason apple's battery management tech really seems to get some life out of their batteries.
Also, once they started validating batteries so ifixit type places couldn't drop bad batteries into phones, a lot of the trouble there went away as well.
Anyways, a screen replacement under apple care is $29. I'll report back how "terrible" the process is (first time in years that I've broken my screen).