The fiber connectors of type SMA do not have a spring-loaded ferrule (such as FC type connectors do).
The receptacles do not have a limit stop.
Since the length of the ferrule is not defined precisely, the emitting point in the fiber coupler is not properly defined.
In case of a 0°-polish this is not a problem since you can adjust for this by adjusting the axial lens position.
However, in case of an SMA fiber connector with an angled polish, the emitting point additionally moves laterally with ferrule length.
In order to compensate for this lateral displacement, a TILT alignment is absoluetely necessary.