It is very odd since there isn't anything of monumental importance there. It does warp you right next to a dark world warp and a fairy fountain so it's a little convenient, but those can be found in many other places. I guess I would have to agree with you that it is pretty much useless.
To be fair though, the only warp that is actually 100% useful is number 6 since you need it to get to the 6th dark world dungeon. All the other ones just help you move around the overworld more quickly. Number 5 is the most useless since it warps you directly to a dead end that leads out to a dungeon you would have already beaten, but at least it has a warp and a fountain nearby.