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When people talk about CPU limitations on the rPi, they aren't talking about just the actual processing portion of the machine. There are also a lot of other corners cut for basically all SBCs. Including bus width and throughput.
The problem is that when you use a software raid, like ZFS, or it's precursors, you are using far more than the CPU. You're also using the data bus between the CPU and the IO controller.
"CPU usage" indicators don't really tell you how active your data buses are, but how active your CPU is, in having to process information.
Basically, it's the difference between IO wait states, and CPU usage.
The Pi is absolutely a poor choice for input/output, period. Regardless of your "metrics" tell you, it's data bus simply does not have the bandwidth necessary to control several hard drives at once with any sort of real world usability.
You've wasted your money on an entire ecosystem by trying to make it do something it wasn't designed, nor has the capability, to do.