Roms will vary for your phone.
You can cut off location services, contacts in the Google cloud, and if you have the apps you want, you can cut yourself off from the Play Store and other services, all without root.
With root, you can customize further and if there's not a rom for your device to suit you, you can still block all access to ad sites, install DroidWall and even install a root app that takes away permissions from other apps.
Android is all about choice.
If yours is to cut off and away from the mother ship, there's nothing wrong with that, and nothing should stand in your way.
Welcome to the forums!