You don’t need an aircraft carrier to transport helicopters along your coastline.

If you want to do a serious amount of industrial/emergency work in an expedient manner, yes you do need something like this.

Evacuating people? A helicopter going 5km back and forth to a vessel like this can rescue an order of magnitude more amount of people than a landbased helicopter with a base 30km away, it is simple math.

Same principle with delivering lifesaving supplies to disaster zones en masse where roads are impassable.

This vessel could also rescue hundreds of people from a ship sinking by maneuvering the ship close and minimizing flight time in a way a helicopter coming from far away just categorically cannot do.