I'd be more likely to try this out if the game supported using multiple tugs to move a single target.
If we could do that, we would not need a separate tug design for each weight level in our navy.
For example, I tend to have 1kt, 2kt, 5kt, 10kt, 20kt, 30kt, 50kt, and 100kt (and multiples of 100kt) weight classes for military ships.
To move all these at the same speed, I need a tug design for each weight class.
That means 8+ additional shipyards, and corresponding fleet management complexity.
But if I could use multiple tugs to pull a single ship, I could probably get by with 3 tug yards (1-5kt, 10-50kt, 100+kt).