Why does he have to be so big?

I like the new Galio but his size is just ridiculous. It just makes the whole rivalry with Sion look silly and his role of demacian guardian not very believable. How many demacian soldiers are stomped and crushed as collateral damage with that thing on the battlefield?. Even his splash shows him unintentionally destroying buildings he is supposed to protect. It all comes across as a joke.
Does he have any clear weaknesses? Is he hollow on the inside and deceptively lightweight for his size? I think making him huge is a gimmick that doesn't add much to his character and would probably be better off keeping him somewhat normal sized.