Interesting, even from the comments it seems people either blankly accept all the requests or don't accept them at all.
Somewhat related - I remember reading that when Facebook engineer decided to add a message feature to a friend request, Zuck got really pissed at him. I suspect that's because "# of connections" is a really hot metric, and it grows exponentially for people who blankly accept every request.
Thus, from LIN point of view, it makes sense to sacrifice UX for some people to get a sure growth for everyone else.
Now, if that "growth" is just a vanity metric, now that's a whole other story.