Browsing speed (way faster), readability (formats for small screen), ease of reply, you can set favorites so you browse right to where you left off. It's just easier I've found. I won't browse / reply if I'm trying to do it in a mobile browser. If you don't find anything missing using your browser more power to you. Frankly it bugs the crap out of me. 30,000+ reviews, 4.5/5 rating. People like it, and I presume some of them are more eloquent than I. Check the reviews.