But you do sign in to use an Android phone, or iPhone. Although, I agree with the point that someone would never want to sign in with their Facebook account there, with FB account holding so much personal information about them! For gaming, somebody would rather prefer to use an alias like dungeonmaster669 instead of their verified actual identity.
You don’t have to sign in to use an iPhone or Android phone, though you to have to sign in to use their app stores. Presumably with the advent of DMA though you can avoid creating an Apple ID or Google account if using a 3rd party store (though probably you’ll need some other account for that store, that’s how it always goes…).
Fe: gaming - yes, this is why Apple had separate IDs for gaming center.. and I think Microsoft does this too for Xbox vs Microsoft account?
I also basically have to have a smartphone, and smartphones are entirely self contained devices.
On a scale of trust for how companies are handling my data, Apple, and to a much lesser extent, Google, are still more trustworthy than Facebook, I feel.