Regarding Sith troopers, Palpatine has the best of both worlds, no matter how twisted they may be. Born and not cloned like the head hooded honcho’s previous efforts, which led to the Clone Wars, Sith troopers are human, like the more recent forces that defended the Galactic Empire and, later, the First Order. The improvement (if you’re an absolute tyrant, of course) is that by being indoctrinated into the Sith Eternal from an early age, Sith troopers are far more devoted to their rulers. As a result, they have even less chance of establishing their own identity and defying their superiors. Taking away this little issue allows them to become a more imposing force that will remove anything or anyone who opposes the Sith Order.
It seems even more surprising that after finally nailing down the perfect army, Palpatine doesn’t use the Sith troopers before his contingency plan. Rather than deciding to wipe out the stormtroopers (“all of them”) and usher in an upgrade of military power, he leaves them collecting dust in the back end of nowhere, aka Exegol in “Star Wars: The Rise of Skywalker.” It is then that, somehow, Palpatine returns only to have another plan go up in flames and space dust, proving that he might not have been the right guy to take over the galaxy when you think about it. No offense, your royal evilness.
