I'm conflicted. One one hand, I don't care about Adam enough to care that he died. We only see him in flashbacks. He isn't so much a character as he is a plot device to give another character more depth, like Steve Cortez's dead husband in Mass Effect 3. The real tragedy is that Shiro wasn't given a chance to properly grieve the death of a loved one, so the plot device is completely ineffectual because, for whatever reason, they didn't invest in that emotional beat. It was bad writing.
Also, if they wanted to go through with the "death of a loved one" thing, I think killing off Lance's sister would have had a far greater impact considering she actually had screen time, and we've known Lance misses his family since season 1. There was no reason to give that trope to the gay couple, and they half assed it.