system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] What on fucking earth are Star Destroyers good for?

They always get raped by rebels, from ROTJ to Rogue One, all they do is dispatch Tie-Fighters, and form blockades or chase other ships, that's it.  Can they actually fight?
gpt
Toy have to realise that the Rebel Alliance chose capital ships explicitly based on an anti-Star Destroyer doctrine. The Empire doesn't have this option. They have to pick tactics that will be reasonably effective against any potential opponent. The rebel alliance is only one possible threat, and they've not been active in large numbers for long.

The empire went for a policy of force projection. Large carrier vessels can be active for greatly extended periods, and have the flexibility to deal with a range of opponents.