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ote the above stated caveat that the projectile has to have a constant speed and course *it's very very important*. Firing with a non-zero gyro angle, such as is depicted in that link is no longer a constant speed and course  .
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Ahh OK to that
but I think it's worth reading my explanation of convergence anyway to prevent users from getting confused
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Also, in Hitman's referenced thread, he shows the 90º hook shot there. If you find yourself cleaning up the mess after your initial attack, you sometimes find yourself in the trailing position on a victim you need to finish off. Rather than shooting the zero angle shot from AoB 180, which can be avoided with the smallest rudder correction by the target, the 90º hook shot, impacting at a torpedo track angle close to 90º makes up for a range uncertainty by impacting a hugely greater cross sectional area of the target. It is almost impossible to avoid. That is where you would want to dispense with the zero gyro angle shot for a greater probability of a hit.
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I picked that example because it's the one that fits better into a small graphic, and shows more dramatically the problem. The 90º angled shot was used in the U-Boats mainly for the purpose of shooting when positioned between convoy columns. It had the advantage you mention plus the extra distance travelled by the torpedo before turning allowed the trigger pistol to enable after the initial 300 metres run, something otherwise would have been more difficult in such a narrow place as a convoy's interior