The old aiming system in Naval Arcade worked the same way as in Ground Arcade.
The only real difference in aiming between old Naval Arcade and Ground Arcade was that when you selected the target in Naval, the guns automatically adjusted the current shooting distance to the current target distance. Something you can also achieve in Ground Arcade, when you use a manual distance correction (in Ground Realistic you can get this effect automatically in vehicles with a laser rangefinder).
The interesting thing is, you could actually shoot in Naval Arcade the same way as in Ground Arcade, without selecting the target. You just had to move your guns very high. But because of longer distances in Naval combat, this would be pretty annoying to do all the time. Example of killing a destroyer without selecting it (notice how high I have to move my guns to hit it):
Spoiler

So it just made sense to select the target in Naval Arcade, the same way as it makes sense to use a laser rangefinder in Ground Realistic.
The most important thing is that before this change you had to understand how basic physics works in all game modes. After this aiming change, in Naval Arcade you don’t have to do this anymore, which is weird. It’s the only game mode where whole aiming is now automatic.
For me personally, understanding physics is the most fun experience in the game. I absolutely love doing these types of kills:
Spoiler
Yes, I aimed at the SPG, not the tank in front!


Honestly, you don’t need some exceptional brain to understand that the shell moves at a certain speed. It’s not a laser (which by the way still moves at a certain speed, just incredibly fast), it takes time for a shell to reach specific distance. Especially the shell with a low muzzle velocity.
If the devs ever add automatic aiming to Ground Arcade, these kinds of shots will be normal. There will be nothing special about them. Everyone will be able to do them, because the gunner will make all the corrections automatically for you. But the big question is: where’s the fun in that? Should the devs remove all the skill from the game, because some players refuse to learn?
But I do agree that there should be more detailed tutorials in the game that explain how to aim at moving targets in all game modes, because many players have problems understanding this. I can see this even in Ground Arcade, where many players just aim at the tank directly all the time, even when this tank moves, and then they are annoyed that they didn’t hit the target. There are also doubts whether such players will even complete the tutorial, because for them it may simply be a “waste of time”. But do we really need to add an auto-aim feature to the game because of players like this?