Why cruisers appear so often in science fiction

Why are cruisers so common in science fiction?

Their general-purpose role lets a fictional ship travel widely and handle many missions without a larger fleet around it.

Science-fiction cruisers often fill the same broad role as historical cruisers: they can travel independently and perform varied missions. Star Trek's Enterprise exploration ships fit that pattern, while the Intrepid-class Voyager is discussed as cruiser-like despite the franchise using another label. Andromeda and other fictional settings also use cruiser-like vessels for wide-ranging duties. The recurring type reflects the storytelling value of a general-purpose ship that can go almost anywhere.