There's nothing wrong, per se, with OB Peacocks or line breeding them to develop lines with desired characteristics. No different than fancy livebearers or discus or bettas or whatever.
It's just different than keeping and breeding lines of fish that are as authentic as possible to wild lines.
I'd bet that the first line cross between an OB Metriaclima and a Peacock didn't look like much. But a few generations of line breeding for color, shape and other characteristics resulted in the fish that we see today with striking colors and patterns.
Not gonna worry about it too much then, I think I just wanted to avoid further cross breeding.
I guess that's why species tanks are very important and relevant.