Besides, why do you care? It works and that's enough.
I downvoted your post because with that reasoning we'd all still be programming software in 8-bit assembly. There's nothing wrong with asking why some games do some things differently than others, it can spark interesting discussions especially regarding file packing, asset loading etc, even if the actual answer is as simple as "no reason, it just worked well enough that way". Answering "why do you care" is no way to foster a community of thoughtful and well-rounded programmers.