Lore-wise, your char doesn’t know for sure if s/he will make it back when you go.

I guess that answers how RPers could do WoD at the start.

Oh this will make the rp alot more interesting

Hell, Khadgar calls it a suicide mission when you first speak to him. 

Which, when you think about it, makes Thrall leaving Aggra and two kids along behind even more bullshit.

Disregarding the fact that Thrall shouldn’t be going to Draenor to begin with, how is losing both parents any less bullshit?