https://bbs.archlinux.org/viewtopic.php?id=120003
2011 people having problems with multiple apps trying to use audio at the same time. This is one of the things that drove me away from desktop linux in 2008. 3 years later it still isn't a solved problem. My gut tells me that in 2013, it's still not a solved problem.
I've no doubt that some people get it to work for their use cases OK. But the fact that it was, even 2 years ago, enough of a problem that people still encountered it... architecturally, that's a symptom of something really broken.
I'm not really interested in learning the ins and outs of modprobe and kernel driver recompiles to try to get sound working as I expect it to - it works the way I expect it to on my macbook, which leaves me time to do other more important stuff.