I don’t have an 8 Plus. Why do I have to install it? Would be great if Apple gave us an options instead of constantly pestering with updates.
You know that you don't have to install every update when it comes out, nor do you have to be "pestered" by them, right?
If you ignore updates you'll get an occasional update is available dialog with the option to install it overnight when you're asleep. It doesn't have to bother you at all.