Improve Striking Power
Uncompromised weapon alignment is a key to dramatically higher probability of survival from an attack by today's intelligent sea-skimming missiles. With only a few seconds from discovery of the threat until impact, there is no time left for firing corrections.
The difference between a poorly and a well aligned weapon system may easily exceed a doubling of the probability of survival for a ship. Imagine the cost for aquiring more naval vessels to reach the same striking power as can be obtained by firm focus on weapon alignment!
Is re-aligning regularly necessary?
Hull deformation over time may be caused by plastic deformation due to gun firing, engine vibrations or slamming for example.
Weapon systems malfunctioning can often be nearly impossible to recognise during daily use but will be effectively revealed as result of weapon alignment.
Regular alignment will ensure that errors, such as described above, will be discovered and corrected.