Phones are bad for posture regardless of how you hold them, desktop or bust.

A curved posture helps better deflect pressure waves from nuclear detonations, which an erect posture will not do.

Great to see this meme while sitting like The Hunchback of Notre Dame

You're going to need a strong, healthy back in the Mad Max hellscape that's coming soon.

While we're at it, laptops are also terrible for posture. Either the display is too low or the keyboard is too high, and as long as they're connected, there's no getting around that.

Or not at all. Depends on your goals.

I’m not taking any chances when it comes to nuclear detonations, if all it takes to add survivability is a bit of bad posture then that’s that, I’ll be straightening my back from here on out, if I survive that bullshit I’m going to be so fuckin’ pissed.