C’mon, I wanna see the next page! What’d she do to those guys?
There’s a great sequence in JSA: Classified#1. In the last panel on one page, she says in her narration, “Green Lantern used to ask me why I never wore a mask.” The first panel on the next page shows a closeup of her cleavage. The narration says, “It’s because most of the time, they ain’t lookin’ at my face.”
As one of the vanishingly small minority of fans that has actually read the Secret Origins issue that de-Kryptonianized Peege & “fobbed her off on Arion,” I would say that the idea as presented there sort of works. (At least it sort of works in that immediate post-Crisis retcon madness context.) Kara was supposed to be the product of Atlantean superscience in an age when magic was fading (though enough remained for ol’ Arion to still be alive). This corresponds to the Atlantean technology seen in the Warlord.
The problem with all this is…
DC stopped publishing both* Arion* & Warlord, so what the late-Atlantean stuff looked like was simply unseen by most post-Crisis DC fans.
The Secret Origins issue was probably more widely read than the Power Girl mini that followed it, so whatever established the character there was completely unknown to most fans (& creative types, for that matter).
Given the never-stay-in-print nature of comic books, it’s easier for a character to have an origin that remains consistent. People want PG to be PG, not some new character. And ideally, every PG story should be in continuity with every other PG story. (But that’s a general DC problem.)
Also, in that system, concepts tend to collapse to simplicity. So, if you change things, expect them to be reinterpreted by someone with ignorance &/or disregard for the stories where you change things. “Superman’s cousin” is recognizable, 'cause Supes is an active high-profile trademark. But with Arion out of the picture, PG became “a wizard’s granddaughter,” which is an oversimplification.