Speed of execution as a goal
When you decide to fish for a few hours without priming, two rods are all you need. Indeed, in this type of fishing, you need to be quick on your feet, and speed of execution, precision and mobility are key words. Fishing with just two rods allows for greater discretion and speed of execution, and above all the fact that, if you have to move because the fish are elsewhere on the water, you don't hesitate for a second. Repacking two rods is much quicker than four, and neither time spent nor baiting on four rods becomes an excuse not to move.
Limited number of spots per station
On closer inspection, there are very few places on a lake or river where more than two or three spots can be fished correctly without getting in each other's way. I do sometimes, but very rarely, use a third rod in this type of fishing if the chosen spot has a very large number of potential spots and the rods won't interfere with each other.
Rod placement requires careful thought
Carp don't like wires in the water, and you always have to think about the placement of each rod to see if it inhibits another. It's more common for me to fish with one rod than three for fast fishing without priming. Never 4 rods. In fact, when I was still fishing with 4 rods (which is now about fifteen years ago), I lost count of the number of times the 4th rod was used as a joker rod on an unlikely spot because I didn't know where to place it...
For fast fishing, try fishing with only two rods. These are the best schools for understanding the advantages of using only two rods and applying them to longer fishing...
