You can follow the redundancy rabbit hole all the way down to China, have back ups and back ups for your backs up and ups and generators or solar panels and so on. None of these are really needed if the system in place is well maintained.
Unless you are keeping a goblin shark or something extremely exotic the 3 layers of redundancy I mentioned are enough.
"I am open to the idea that I am incorrect here, and in this case would be open to consider that it may not be worth the time and effort to put into this subject"
This, it simply isn't worth the effort beyond having simple effective back ups. You can drive yourself mad thinking about this stuff, gfci tripping, power outages, heaters exploding, heaters breaking the sump glass, temperature controller failing, wifi failing not getting alerts and so on.
I will continue to thoughtfully consider all ideas.... I didn't think I was chasing down a myriad of possibilities in my example - but a solution for a real scenario, which would cost me $30 and the time it took to plug one of my heaters into a different outlet. Perhaps not worth it to some, but to me this seemed within the realm of being both "reasonable" and effective. Thank you for your ideas.