One adage in baseball is that you never have enough arms. What it means is that pitching is important and good pitching is always at risk. One of your pitchers might get injured, or might flake out. A minor hitch may cause one of them to lose the strike zone. A situation can come up where you just need a slightly different skill set, and then you realize that you need that skill set regularly.
Same thing in recruiting. If you’ve built a great team and they are performing beautifully, you still can’t let down your guard. You never have enough arms. Even if you don’t bring them in, you have to keep the pipeline full and the best possible additions in your queue.