For another, in my experience a lot of current sensing options are just a bit.... suspicious on the accuracy front. I've had resistive sensors tell me 1W is flowing through a plug with nothing plugged into it. Turning off a resistive load but the measurement slowing falling back to zero over several seconds, instead of dropping immediately. Solar monitoring current clamps that claimed zero current when the power company's meter said we were exporting 20W. Fancy £800 fluke clamp meters tell me 2A is flowing when there isn't even a cable in the clamp. Clamp ferrites getting broken in transit and producing bad results. Installers putting the CT clamp the wrong way. Installers installing the power meter the wrong way around, because the installation instructions assume you want to meter import not export.....
Current sensing is surprisingly hard to get right :)