Has Adobe Flash become irrelevant?
quora.com
quora.com
Providing on-line video with trendy HTML5 tools has a whole bunch of downsides, which have been enumerated much more eloquently and comprehensively by staff from YouTube and the like than I can do here.
Doing it with Flash means you can't support iPhones and iPads.
It wasn't a touch decision for any project I've been involved with, and no amount of Steve Jobs whinging is going to make us do everything at least twice just to support his platform. It just isn't as important as he thinks it is, at least for any of those projects.