Unpopular opinion: Qimir wasn't menacing enough to be a Sith/villain
Don't get me wrong, I like his character in many ways. But he comes across as just as an average, chill dude. He's not menacing or evil in a way Vader or Palpatine is. I get the showrunners wanted to portray a more nuanced dark side user. But I thought Ahsoka already did that better with Baylan Skoll. Qimir just doesn't have a lot of magnetism. And canonically, the dark side leads to total corruption and evil in the Star Wars universe, so there's no in-universe justification to try to present Qimir as somehow a more ethically minded Sith. An ethically minded sith does not exist.