Not sure the SS/QPR on a Saturday is the biggest hindrance, maybe a minor one.
Even if Super Rugby were played on a Sunday, the Super Rugby season only overlapped with the QPR/SS for 8 rounds. In the Reds case they played 4 of those rounds on a Friday night, 2 of which were home games. Of the remaining games that weren’t played on a Friday night, only 2 were home games.
So statistically speaking, shifting SS/QPR games to a Sunday might allow some of the reserve/bench Super Rugby players to backup from the Super Rugby game the night before and play an extra 2 games a year based on 2024 season draw.