Re: Shadowfall rescue ship takes off to soon
My guess is that Respawn wanted to ensure that Legends don't sit far away from the Evac ship for a long time. Forcing the Legends to push to the Evac ship gives the shadows an easier time spotting them before they are near the ship.
If you think about it, imagine playing on the Shadows team. If there is 2 legends left, for example, the Shadows will after a period of time, go hunting for the last two Legends.
The Legends might be able to take advantage of this spread of Shadows and push, only having about 3 of them in their way.
Now, because they only have a few seconds for the Legends to get to the Evac ship, they must bring themselves out of hiding and run for their life immediately.
60 seconds: "Oh hey guys, we can just stay right here and hide. Or just snipe them until there's a big enough clearing for us to get through!"
15 seconds: "We gotta move! we've only got a few seconds, we'll just have to push through and hope for the best!"
Plus, making it a rush time makes the "run for my life" more of an experience, and more like a real Apocolypse.
Anyways, this is just my speculation. Hope this gives a bit of an idea of why the Evac ship leaves so early 😉