Typically you can use strafes in situations where you face a coordinated attack from several locations.
You are able to obliterate a medium opposing stack, whilst maintaing the position you want, and preventing your opponent from succeeding in his plan.
Alot of people don’t account for the fact that you might attack them, only to retreat.
The strafe is also an excellent tool to use, when you plan on building into your force anyways, and even more so, when after the said attack, many of your units previously tipped, will be healed by your next turn.
Suddenly your opponent went from having a superior navy on his turn, to having a damaged, and inferior navy, out of position, facing off against a superior strike force.
By the old rules, when battleships healed at the end of a combat round, this was particularily devestating. Â If you managed to muster 4 to 6 battleships, and you found ways to hold on to the initiative, you were practically invincible.