[DiapDealer]

Not being able to read offline is a huge downside that goes unmentioned. Try as they might, all server-based reading systems will eventually offer solutions for offline reading. If they don't, they're either relegated to the ultra-niche, or the almost-dead-in-the-water (and often both).

Sever-based reading systems without a client app also guarantees mobile-users won't use it. Nobody wants to read anything in a browser on a phone for any length of time at all. Heck, nobody on a phone wants to even open a browser.