Where can we use conditional clearance?
Conditional clearances can be issued for any stage of flight, but are usually not as they increase risk outside of the areas that you have listed.
In the en route environment a controller can issue conditional climb instructions for example:
SIA1223 at DOGET climb to FL340
BAW2283 passing FL250 track direct DROGO
I have never issued a clearance like that and some contries have made them not available in their regulations. But they do exist in other phases of flight.