system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How necessary is Vader once the Empire was created?

Can't Imperial intelligence and military forces find and kill remaining Jedi? Everything else can be done without using the Force. And without Vader, you don't have to worry about anyone having the specific life goal of overthrowing you.
gpt
Without Vader it would have been very difficult to kill the remaining Jedi.  A Jedi can a squad of normal soldiers in a fight easily.  The only reason Order 66 worked as well as it did was the element of surprise.  The Clones themselves didn't even know they were going to open fire so the Jedi precog didn't work and they were taken down mostly by overwhelming blaster fire to their backs.  A jedi in hiding is going to be actively watchign for Storm Troopers trying to take them out and if you send bounty hunters instead you'll trigger the Jedi Precog and they'll peace out before you can trap them.  Vader was able to fight a Jedi one on one and mask his presence to get the jump on them.  Vader is also useful as an intimidation tool to planet leaders and your own officers.