Ironically if they'd kept the original origin, or something closer to it, she wouldn't need to fight the system. Original Babs didn't grow up with the dream of being in law enforcement so the writers didn't have to come up with reasons why she couldn't join a police department or the FBI like women do every day.
I can't also help but say that I think original Babs would be a lot more of a match for Bruce no matter how dickish a writer felt he had to make him. She was an adult who expected to be treated like one. In this version she seems to relate to men more like an adolescent, which she almost still is.
I admit that for me it seems not just as if the writer needed Bruce to be a dick but just that he couldn't really conceive of Babs as originally written. I could be completely wrong here, but it just feels like even less about Bruce needing to be a manipulative ass as Babs needing to be less able to deal with him as an equal--she's got far less power in every way--smaller, younger, dependent--both in terms of not being an adult but in being more of a danger to herself.