Given that they barely even bother making meaningful updates to Safari ever since Google absconded with all the talented developers when they forked off Blink?
YEAH, RIGHT...
Let's be frank, Safari on ALL platforms is aging like milk, many developers have taken to calling Safari "The new IE", and they actively do everything they can to make it harder to get a alternative browser onto an iOS setup.
Increasingly it seems Apple could give a flying purple fish about the web, much less web apps. Whatever they have up their sleeve it certainly doesn't seem to be web technology related anymore... as it seems more like they want to just coast on what they have IE6 style... since they know that for now developers will bend over backwards to support their overpriced trinkets.