@atatassault it's cheaper this way?
an actuator and a microcontroller will cost less than a mechanical governor / feedback control mechanism (and be more reliable / require less maintenance)

also it allows for more advanced functionality, software controlled hardware
like more efficient engine control / advanced-driver-assists / etc
an extreme example would be tesla's infamous "full self driving"* as a hypothetical hardware fully controlled by software
*does not actually fully self drive