standing in front of a mirror is the easiest way to take a selfie

that's just because that's where their mirror is. its a wider perspective than a hand-held selfie, similar effect to someone taking a picture of you but without the need of a second person.

They're too cheap to buy a $10 selfie stick.

They don’t know how to press the flip button so their camera is facing them.

They look in the mirror naked and think everyone should see this

Often, the bathroom is the ideal place for privacy

Never done that

I think they want more of a body shot, or some to hide their face.

Isnt it easier to get the shot you want when you are taking a picture of yourself in the mirror as opposed to setting up your camera and hoping for a good shot🤔

Also there's a technical answer but taking a photo of yourself from arms length tends to Mahindra those things closest more than you think... In reality you end up with a big hooter!... And for all you North American types, that's your nose ;)