Its not exactly a single loop though either. If 1 set of pumps fails, i wont have flow to that part of the loop.

While u get advance in our hobby
I think of myself as advanced, just because i dont have your setup (Then again i dont ahve a MM Acension + Pedestal to fit 6 rads into anyways, and i dont want one either.... i have enough bar stools/couch tables), doesnt make me less advanced.

This is my system.

not sure if you can make it out, but the left side of the bench, is the CPU only loop, and the right side is for everything else.

It has dual d5's on each "loop". if both pumps on one side die, that loop (either CPU, or GPU/ram/mobo) wont get any flow... I have the ability to turn on/off the pumps, and ive tested to see (with a flowmeter) if one side shuts down if it will get any flow.... it doesnt. Can you please explain to me where you assumed that it would get flow?