It's called the 'teething period'. Things are sometimes not like they used to be and therefore confusion and in some cases rage inducing begin. haha.
Hope you enjoy your new iPhone 6s Plus! its a wonderful choice and I'm sure you will enjoy the battery!
Also Welcome to iMore! hopefully this won't be your last iPhone purchase
It's a teething period indeed I'm still adjusting, but I'm really enjoying it so far. I do miss being able to schedule ring profiles. On my Samsung, my phone was set to automatically go to silent on Sunday mornings for worship. Then on workdays beginning at 8 it'll change from loud to beep once . I never worried about manually changing the profiles . It irks me too that I can't find an app that allows me to set the backlight to remain on for specific apps.
I miss the freedom of customization. But I'm loving the phenomenal battery life.