Here’s the reason: so she can be revived next season

Uldren was one of the only real characters in D1, one of the few who didn't treat us like a God and go out of his way to kiss our a$$ like everyone else He was well meaning, tried to please his sister , she used his affection for her benefit, then the Taken Wish Dragon Riven twisted him on turning on his people ,and he paid for that with his life , then he was Risen has Crow, and Crow dealt with being killed over and over by dense immature guardians like yourself , then Savosiris took pity on him, or just thought it would stir the pot a little more, and brought him to the Vanguard , who even though personally hated Uldren Sov for killing there freind and fireteam member Cayde, recognized that Uldren had already paid for his crimes with his life, and Crow was a new guardian, something they needed at the moment I will admit Bungie ruined his character in Season 16, got someone killed because we were scanning Hive lightbearers, he had enough experience at that point not to do something so stupid and just seemed like a plot device to get Saladin on Caitals war council But since you probably stopped reading several paragraphs ago, I will just say this, Crow is the future of Destiny , like him or not, he will be Hunter Vanguard, and his former lifes relationship to Mara Sov ensures Awoken alliance (although not needed because Mara would help us anyway) And don't fret, even though by lore and story purposes it's not possible, Amanda will return one day , no one is ever really gone, in any fictional universe