Ple-Sen
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Perhaps they did it this way to avoid a situation like Blizzard's retcons. I always remember the story with Garona:
Initially, she was half-orc, half-human, which perfectly matched the timeline and was fine. Later, Blizzard decided to change the dates, making it so that the orcs attacked immediately after opening the portal to Azeroth, which automatically made Garona a baby. Then they came up with a clever excuse – Garona is half-drakei, not human, but drakei look like humans, so there's almost no difference. And then the expansion for the third Warcraft came out, where we saw that drakei don't quite look like humans. And then they came up with a new amazing excuse, saying that yes, she is still half-orc, half-drakei, and Gul'dan magically changed her appearance to make her look half-orc, half-human so she could gain the trust of humans. Because, of course, it would be very stupid of him to give her a completely human appearance.
By making the entire plot non-canonical, they avoid the need to make such retcons in case they miss something.
Initially, she was half-orc, half-human, which perfectly matched the timeline and was fine. Later, Blizzard decided to change the dates, making it so that the orcs attacked immediately after opening the portal to Azeroth, which automatically made Garona a baby. Then they came up with a clever excuse – Garona is half-drakei, not human, but drakei look like humans, so there's almost no difference. And then the expansion for the third Warcraft came out, where we saw that drakei don't quite look like humans. And then they came up with a new amazing excuse, saying that yes, she is still half-orc, half-drakei, and Gul'dan magically changed her appearance to make her look half-orc, half-human so she could gain the trust of humans. Because, of course, it would be very stupid of him to give her a completely human appearance.
By making the entire plot non-canonical, they avoid the need to make such retcons in case they miss something.