Servo motor always limited in range?
RC servo’s use a linear Pot for internal feedback are limited in range usually by the rotary magnet.
But if you have a gear reduced motor e.g. 1000:1 with a sin/cos pot, then you can have continuous 360 deg control. But these are vastly more expensive. I used them in the late 70’s with Bourne Pots and Swiss motors for an XY scope auto zero and rotate phase to a reference from an eddy current test signal.

stepper servos use an external “home” or Trk0  index sensor for a reference like Floppy Disk drive head actuators for continuous control.;