Why even ships without hangars need aviation facilities

Is there a case for a modern warship to have no helicopter facilities?

Most need some provision for personnel and supply transfers, even without a hangar; very small ships such as Skjold can instead be candidates for drone facilities.

Moving personnel and supplies gives most modern warships a reason to receive helicopters. A ship can provide that service without carrying a helicopter permanently. A landing deck and refueling capability may meet its needs even when a hangar is unnecessary. Very small vessels such as the Skjold class are the stated exception, although provision for drones is suggested for them.