Why a catamaran carrier complicates landings

How practical is a catamaran aircraft-carrier design?

Its wide deck is attractive, but the beam amplifies height variation across the flight deck and complicates landings.

The broad beam looks attractive because it offers a large deck. In practice, roll and wave motion create a larger vertical difference between opposite sides of that deck than on a narrower monohull. That changing landing surface makes carrier approaches more demanding.