I have honestly never seen a clash on tv, even the raiders (against who we wore the red shirt this season) I haven’t had an issue with.
If we’re talking about other professional sports pretty much every NRL club would fail. You don’t see EPL sides playing in the inverse of their home shirt, away shirts are normally a very big change from the norm. If you were advocating for such a change I would say fair enough.
I'm a bit confused, you're saying that the Rabbitohs home/away system provides perfectly adequate contrast in the NRL but also that the NRL in general fails to do so by world standards?
The EPL is an exaggerated case since the clubs are as uncreative with team colours as your team is with away designs.
Somewhere in between the extremes is probably fine. If an away design with inverted colours contrasts with the home design (like the Eels home/away from this year, not the heritage they shoe-horned in) then its perfectly adequate. If the club colours don't contrast well, and Souths' red/green is possibly the worst of the lot, then an alternate colour would be required. Clubs had been doing that for years with predictable white away designs. There are plenty of other light colours that certain clubs could use without destroying their identity.