The bit about Apple's "proprietary event model" rings false. While Apple ran out an implementation before there was a proper spec, there is now a draft spec: http://dvcs.w3.org/hg/webevents/raw-file/tip/touchevents.html and Android implements roughly the same thing, with the same events.

Labeling this proprietary makes it sound like there was some legal or technical blocker from using the same kind of spec: there was none, and MS's namespaced events are afaik an arbitrary decision and a bad one.