Maybe it's just that OS X is not a big enough market to justify the development costs of a native client. The cost/benefit for native vs web is surely quite different for iOS vs OS X.
I think a lot of these native vs web debates tend to be too black and white. The right solution depends a lot on what you're trying to build. If you're building something very content-heavy and broad distribution is more important than optimizing for any single platform than the web is probably the way to go.
If you want to present a very interactive, media-rich experience or you want to try to make money directly from the app itself then you should probably go native.
Native is going to be important. The web is going to be important. Mobile is obviously growing but the desktop is not going away either.
I think a lot of these native vs web debates tend to be too black and white. The right solution depends a lot on what you're trying to build. If you're building something very content-heavy and broad distribution is more important than optimizing for any single platform than the web is probably the way to go.
If you want to present a very interactive, media-rich experience or you want to try to make money directly from the app itself then you should probably go native.
Native is going to be important. The web is going to be important. Mobile is obviously growing but the desktop is not going away either.