I think there's definitely a way to do a Bruce/Babs romance and then there are all the ways not to do it.
We're gonna have to agree to disagree on that one. I'm fine with exploring alternate versions of characters, but there are just some relationship dynamics that are always gonna be set in stone for me. And with Bruce and Barbara, I'll never not be able to see him as her second dad/perhaps even much older brother, depending on the version. So them locking lips just feels incestuous, even ignoring the betrayal aspect to both Jim and Dick.
I'm not limited to thinking that way with just those two, either. Arkham Knight paired Barbara and Tim Drake up as not only lovers but soulmates who married, and that left quite a bad taste in my mouth after growing up with comics and cartoons that depicted Tim as the younger brother that she would often jab or counsel in dire situations.
One of my favorite issues of Batman of all time is actually bookmarked by them acting as siblings, since it involved Batman and Gordon patching things up after the one-two punch of Knightfall and No Man's Land had messed up their friendship.
So, yeah. Fuck that too. Love the game, but Arkham Knight's treatment of that one specific character dynamic can jump right off a cliff.