There isn’t enough armour you can put on a warship that will withstand the ability of modern munitions to punch right through it. That’s why they started developing systems to target the munitions before they hit the ship in the first place.
yes. IF the systems always work.
First hit that gets through? Ship can’t fight back.
Or has lost propulsion.
Or has lost missile battery.
or has lost power.
Or is on fire.
or has lost radar.
or has lost the (one) gun that it has.
or has lost the (one) helicopter it can carry.
or has a dud bomb inside the magazine on top of the the missiles down there.