Personally, I think for many systems the return pump is an overrated piece of equipment.
For most of us, the single largest and most important filter in our tanks is the live rock in the DT. I am much more concerned about losing my powerheads than I am my return pump. If I lose my return pump, I only lose my skimmer and heaters. I can do without those for days and my temp will stay over 72F without my tank crashing. I am much less confident that I will have enough flow for biological filtration if I lose my powerheads. That is why my powerheads are on battery backups while my return pump is on an EB8 and GFCI protected.