The idea came about while talking to someone that has actually been on ships. They would often put markings on the ship to indicate where guns would have the best shots on an enemy or as navigation aids. On the point of buffing the Galleon, that is a bit silly since every other ship aside from the Junker is simply point the ship at the enemy and let guns shoot with zero communication required. The Junker is also better since most light guns have better arcs and you can see three guns from the helm. So, it is neither an unrealistic immersion break (as it was done in real life) nor an unfair buff to the Galleon.
How about a compromise. Make it a 'Training Theme' that can be removed. Make one for every ship. Flags can be added in themes as well to help with movement on guns.
I still believe, in terms of the communication required, that this will just further push ships that require more crew input into being the pilot's toy. Considering I am not a competitive pilot, but instead crew, I may have some biases, but I sincerely dislike the idea of 25% of the players actually mattering. Plus, this "training theme" would just become the default theme for everyone as it provides an objective advantage. For gun arcs and control. I don't think of it as an unfair buff to the galleon, but definitely a removal of what makes it an advanced ship. In short, dumbing the game down.
It was always supposed to be about communication, and not just communication between pilots exclusively. Gun arcs is part of that too, hence the "turn ship x side" voice commands being available only at gunning positions.
Regardless of the actual ship business, perhaps the design irks me more in terms of immersion. A marker that isn't an actual crosshair would certainly be far more pleasing to the eye.