Why a runway emergency hook differs from carrier landing gear

If land-based fighters already have tailhooks, why do carrier landings require a different design?

An emergency arrestment and repeated carrier recoveries impose different demands, and runway systems stop the aircraft over a longer distance.

A land-based fighter's emergency hook is intended for occasional use, while a carrier aircraft must withstand arrested landings repeatedly throughout its service. The distinction concerns the surrounding structure and its service life as well as the hook itself. A viewer challenges the initial suggestion that emergency use would wreck the aircraft, prompting clarification that the hook could require replacement and the airframe careful inspection. A later correction adds that runway arresting systems stop aircraft over a much longer distance than carrier gear. The exact maintenance requirement is recalled from memory and remains qualified.