It is all done to follow the plot of the general story of star wars and to have Republic and empire fighting, while also to have a reason for when the sith empire to fall in 3630 BBY and only the republic remain as the major power until like the prequels.

Yeah i got the same problem too, for some reason the quest does not show up where to go or what the "first in flight" is. Like for some reason when searched up "revenge of the bane brigade" or "first in fight" there is absolutely no tutorial or infomation of this

I chose ofcourse peacekeeper and to dethrone the empire as my pure noble Jedi. But as my Sith warrior Juggernaut, I chose peacekeeper again. As I see my sith character and the choices I made to have only sought power to defeat my enemies and was cruel sometimes to get a point across, being in desperate situation or to protect my companions. So I was mostly dark side focus to my choices but often chose light choices. When it was either pointless cruelty or other stuff I just chose the light side option. Like even though I know I'am really powerfull I send civilians to death just to cover me and just to look evil, or to do something bad to my companions. As far as I remember I never chose those kind of choices. I never sought power to be a conqueror and subjugate other people under my rule, as I also don't see my character being someone political with always going around the galaxy on adventure and missions. So being Emperor did not feel right for that character, even though peacekeeper being a light side choice and me being sith.