GMs are just customer service reps. They have a guidebook and a script and if your request is a bit of an edge case (typical of us) then they have to improvise or just do the best they can.
I like to think of it like waitstaff at a restaurant. You're making oddly specific requests like "hey can I get this side subbed for half of that entre, will you bring me ranch AND italian dressing on the side and I want cheese on only half my cheeseburger".
Is that possible? of course. Is it allowed within the guidelines of the establishment? Maybe. Maybe not. If its not, maybe you catch a cool waiter and kitchen who cut you a break anyway. Or maybe you catch the new guy who is like "man i dunno, i dont think we can". Or maybe you catch the rules nerd who just straight up says "no".
This is why when you're doing edge case shit like "can I get my xp turned back on on this nonsubbed account" its best to have that link to their article that lays out exactly whats going on. Makes it clear for any new people or rules dorks or whatever that this is a thing and here's how to fix it.
But to continue the analogy, if you're an asshole to the waitstaff because they either dont know or wont help you with your problem and you act like an entitled brat about not getting special treatment... then good luck ever getting served in that restaurant again. Or not getting a wad of spit in your side of ranch.