I guess that just as with the native email client, there's not much development happening on the native SIP dialer. Instead of improving the core Android apps,

I guess that just as with the native email client, there's not much development happening on the native SIP dialer. Instead of improving the core Android apps, which would benefit other phone manufacturers as well, Google is mostly working on their web service frontends (Gmail, Google Plus, probably Google Voice as well) nowadays. The result is a platform packed with features that only work half the time. Did you know that the native Email client doesn't even set the In-Reply-To header, i.e. breaks threads?