Spitoon makes good points. So how often does the situation arise when you wish an aircraft to maintain its current altitude while intercepting the localiser, but do not want it to descend with the glideslope?
In other words, is there ever any point in in splitting the intercept instruction from the descent instruction like:
Closing the localiser from the left/right; report established.
Descend on the ILS, QFE (pressure) [millibars].
rather than
When established on the localiser, descend on the ILS, QFE (pressure)
[millibars]/QNH (pressure) [millibars], [elevation (number) feet].
?