Identical model motors vary, so each needs to be calibrated by banging against some edge ... think of the banging noise when an inkjet printer is turned on. Servo motors are good for robot wheels that have to turn a certain distance then stop. They are good for robots that have to balance themselves somehow. Auto pilots can use these to navigate a hallway. They are not good for spinning propellers like brushed dc motors and brushless motors.
Variable speed motors do not necessary have the hall effect probes. The electronics in the ESC pulses the motor to tell it is initial direction and some other feed back system humans using RC or an autopilot reading accelerometers or gyros adjusts the speed.
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