Gen Z takes selfies with the higher quality back-facing camera using 0.5x zoom. You can't see yourself while taking the photo, but that's part of the appeal.
A lot of older cameras (and early phones too) would have a small mirror next to the lens, specifically for taking photos like that. The word selfie is kind of recent. The concept of taking a photo of yourself is probably as old as the invention of the camera.
I remember watching a podcast at the time where they were making fun of the word selfie for being an absurd unnecessary word. I remember vehemently agreeing.
I'm from the generation where that was the only option (and I still wasn't a kid then). I kind of liked the mystery, but overall I still prefer the front camera for selfies nowadays.