We use highside sensing of the current, because there is always a voltage drop over the shunt. If we have the shunt at the low-side, then the voltage over the load is reduced, depends on the voltage drop over the resistor. It is better to measure the voltage at the high-side and have all the loads connected directly to GND. The problem her is, we need for the OpAmp a at least 2 Volt higher source-voltage as we have at the shunt, this is a problem, especially if the load is driven with a hundred volt. The OpAmp does not work with 100V.
The voltage over the load is reduced if the shunt is on the low side or on the high side. I don't see the advantage of using high side shunts except when the shunt fails then the load drops down to ground voltage and not up to max rail voltage as in thr case of ground side shunt.
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