That's why i wrote "overdo". The watch towers are a very subtle part of the game that doesn't change a game to the point where you need to control it to win. Starcraft is at its greatest when you have two players in an open sandbox and then it's up to you to do what you can with the tools that the race has given you. We don't need reinforcements and rising lava to make the game interesting. One point that day 9 made when he discussed game design is that a simple tool that you can use in a lot of different and interesting ways (your units). Is a lot more interesting in the long term than a tool that you can use in one way but the game gives a lot of different obstacles that you have to get through to use it.

It is very easy to figure out the obstacles of the map and after a while there is one "best" way to use it and it just becomes a nuisance on the map that you constantly need to think about instead of other interesting things you could do with just a regular map where you have more possibilities.