What is a major operational risk of exceeding structural limits during landing?

Exceeding structural limits during landing poses a significant operational risk largely because it can lead to the potential failure of aircraft components. Each aircraft is designed with specific structural limits that ensure it can safely withstand the stresses and forces encountered in various phases of flight, particularly during impactful phases like landing. When these limits are exceeded, there is a likelihood that critical components, such as the landing gear, wings, or fuselage, may not be able to handle the imposed loads. This can lead to catastrophic failures, undermining the safety of the aircraft and its occupants.

The other options mention scenarios that are not directly related to the risks associated with exceeding structural limits. Increased fuel efficiency, improved takeoff performance, and decreased drag are all attributes that might be desirable in an aircraft but are not applicable when discussing the dangers of violating structural integrity, especially during landing, which is critical for safe operations.