Going by this logic why play a warrior when all you have to do in real life is take up a sword and swing it? Or be a hunter while archery is a thing in real life. Just play magic classes then because you cannot cast a spell in real life.
Main reason why people play human is because of the look. Transmogs look terrible in almost everything in alliance side besides Human. Everything is way too compressed on a dwarf/gnome, draenei and worgen posture is meh and the feet ruins it. What else we have ? Kul tiran? I mean come on. Void elf is great but that is still “new”.
You play a Paladin. That’s just an old time crusader, why play something that already is a thing in real life. I’m a human so we have human history. Idk what you are.