Why is the sm-n910p with 5.1.1 seem to be root proof?

I am relatively new to rooting and bought a used sprint note 4 with 5.1.1 cog5 update already installed, and have been waiting around for one of the universal root programs like oneclickroot to drop a root for it, but it never happens. I heard the new security in 5.1.1 is making it impossible? Is there any work arounds? I have seen a couple homebrews show up that seem questionable and limited. Anyone who is knowledgeable is welcome, but please no "newb just read" comments. Those are rarely helpful.

lMO battery life doesn't seem good cause fast charge doesnt really fully charge phone

I went back to the slow charger for overnight charging and battery life has been pretty darn good. When I use the fast charger it says it gets to 100 quickly but I feel it drops down way faster. Anyone else feel this way?