Lanefan
Victoria Rules
Because, I suspect, the intent is that your background is only really relevant near the start of your adventuring career, when you're still adventuring relatively close-ish to home. In other words, it's primarily a low-level feature.And yet it's not written that way, in large part because it would make half the background useless 95% of the time. Why would they even include that feature if it's going to be so completely useless?
As your adventuring career goes on, you become - both literally and metaphorically, and in both time and space - further and further distanced from your home and pre-adventuring background, and that background fades into obscurity to be replaced with the new "background" you've acquired; that new background being what you've done and who you've met during your adventures.