I have a phone. Surprising, I know. I also like my phone, so much so that I installed TWRP, LineageOS and Magisk. This means I can do whatever I want to my phone, take a full backup and do all sorts of snazzy shenanigans.
You may not feel like you need privacy. I know I felt the same way quite a while ago. Maybe you really know why you don’t want people in your private space, but don’t know feel comfortable enough defending your decisions (the question of do you have something to hide? is difficult to answer). This post will hopefully give you at least some ammunition for people who only have the idea of privacy in their subconscious.