I got mine for kicking my leading petty officer's (E-5, I was E-4 at the time) butt in a fan room. He's the one that called into the fan room so he could teach me a lesson and I get the punishment. I got 30 days restriction and extra duty. No loss of pay.
Yeah, once upon a time Art 15 was just the way most things were handled, I was still just an E-3 when I picked mine up.
Lots of times things like you mentioned wouldn't even result in one but it happens, I guess something/someone pushed.
Some days i wish I had re-upped at the time and would have gotten my E-5 right then in 1984, would be retired now.
As far as Bergdahl, GCM, DD, and no back pay sounds right to me.
That in itself would just be saying Cya, many people over time have gotten worse in those circumstances.
Just pressing it beyond that at this point is overkill.