Oh, Im definitely coming at this without taking into consideration DC's ability to actually do it right. And you're totally correct that DC would f**k it up.
But they can't get her right even when she's a high-end, Kryptonian level flying brick with no weaknesses at all. So it's not like we really got much to lose here.
Like I've said earlier, if I had my way she'd be "vulnerable" to bullets, but "vulnerable" like Aquaman is. A direct head shot with a high quality military grade weapon will break the skin and make her bleed. Her armor prevents even that, so you gotta aim for her head or another exposed area, and then hope she doesn't deflect the bullet back at you. Against virtually any other kind of attack, She's far more durable. So I feel like this wouldn't really impair her. If you're lucky enough to get past all her defenses and actually land that head shot, all it's gonna do is piss her off.
It'd make her gear and skill far more important, and I'd rather Diana be seen as the pinnacle of "ability fused with power" instead of just being "on Superman's level." I mean, this is DC so everyone with super strength is compared to Clark and his strength is the unassailable barrier no one can surpass, but almost everything about Diana's powerset is a direct comparison to him (not just a upper limit), and I don't care for the idea that the most popular female in comics (if not fiction) has her powers defined by someone else to such a degree.