you say that while we have all this evidence that major characters do go to these 4 major realms instead of more fitting realms. uther doesn't get snatched up by the light? maldraxxus is really orc heaven instead of something more orc like or even halls of valor?
there is a reason these 4 realms keep the shadowlands running, most souls do in fact go there. (and without any choice in the matter it seems)