Not just sensors and flag bridges, although those retain most of their functionality.
But you can turn a carrier into a collier if you have fighters that are nothing but magazine. Or have fuel pods.
Makes it a little easier to have multi-role ships, when you can just switch out the fighter complement.
You can also have missile pods, ships with a missile FC, nothing but box launchers and no engine. The missile pods are only going to be out of the parent carrier for long enough to launch and return to the carrier, so they won't be exposed to enemy fire. That gives you almost the alpha strike that you would have if the carrier itself were a missile ship, but you can reload it much faster.