Why large space warships may combine several roles

Are Battlestars incoherent because they combine battleship, carrier, and assault-ship roles?

Large space warships may need to perform several jobs, making a combination of battleship, carrier, and assault-ship roles plausible.

A Battlestar combines roles associated with battleships, carriers, and assault ships. That mixture could suit large spacecraft. A ship arriving at its destination needs the ability to handle whatever work awaits it. The Daedalus class provides another fictional example of the preference for a versatile ship.