Bass are cautious predators, especially in clear water and waters that are heavily fished. Here, using a leader material that is as invisible and stealthy as possible makes a lot of sense and will most likely catch you more fish.
Bass and carp actually can coexist and do so in plenty of waters in both the United States and Canada. However, in waters that have an overpopulation of carp, bass populations can be affected negatively and may only recover if the number of carp is reduced and regulated.
For bass fishing per se, you don’t need to use a wire leader, as their teeth do not manage to cut through fluorocarbon line. But in waters that hold a lot of pike or musky, using a thinner wire leader of 10-12lb can reduce the risk of getting bite-offs significantly.