Why did many people doubt the andoconda plan?

Many people doubted the Anaconda Plan because it relied heavily on a naval blockade to suffocate the Southern economy, which seemed ambitious given the Confederacy's extensive coastline. Critics were concerned about the feasibility of maintaining such a blockade and the strength of the Southern forces defending their ports. Additionally, the plan's emphasis on capturing the Mississippi River as a means to divide the Confederacy was seen as a slow and complicated strategy that might not yield quick results. This skepticism was compounded by early Union military setbacks in the war, which further fueled doubts about the effectiveness of the plan.