I also love to use and prefer native apps. But, in my case, I had to offer Google Docs to my dad. Because he wanted to transfer his doc file to his work computer to continue to work on it when he is at the office. So, I thought a web app might be good for him.
Sure it's a perfectly normal thing. I'm talking about Google side of things: they're probably not caring about performance when dealing with 30MB large docs as it's not what people use in their docs anyway.
