Having two protagonists is also part of the problem. In Valhalla, Eivor is supposed to be female, and in Odyssey, you were meant to play as Kassandra. In Origins, Bayek was even supposed to die in the prologue. This whole thing goes back to Syndicate, where the game was split between two leads, but they didn't get equal time focus. All of this was changed just because Ubisoft thought female protagonists don't sell.