To be fair, it's not the first time this happened with CBS Trek shows... it's almost as if some viewers fail to consider that the entire season is scripted and shot together and will routinely complain about things that are obviously going to be addressed for not being addressed right away. Remember back when the Tardigrade was first strapped into the Spore Drive, Discovery jumped and it was obviously suffering, then the episode ended there and people were complaining left and right that the show has thrown out Star Trek's positive message because it was being treated as a pack animal without any regard to its obvious suffering? And they didn't even stop to consider that if this were the case, the show wouldn't show the Tardigrade suffering at all, and lo and behold, it was resolved right in the next episode with Burnham trying to save it and Stamets injecting himself with Tardigrade DNA?
It's the same here for me. The show wouldn't show flashbacks to Maddox's murder if they were going to simply sweep all of it under the rug.