HTML5 for streaming works just fine. Flash has not a single advantage over HTML5. Heck, you dont even need a flash player to watch Twitch streams today. Just fire up your favorite media player and open the stream there. I havent used Flash in ages and I watch Youtube and Twitch etc every single day. And Twitch, the biggest site of them all is migrating to HTML as well, but it takes time to migrate a big service like that. The reason most sites use flash is that old habits die hard.
Just curious. Are you experience in making HTML sites? Cause the people who said the difficulties in making HTML sites make some very detailed explanations. So detailed i just slipped right through my brain.
Maybe twitch can make a good HTML site because they're so dang rich?