Some conventions transcend platforms. The aforementioned greying-out, for example. And sure, we have to try something for it to become a standard. But in the end the standards percolate up because they're intuitive. The controversy over some of these "toasts" shows that they don't meet that bar.
And you are right in that the Growl-style notifications in Mac OS are standard now... but those are different from the ones in question here because they are not related to a control that the user was just manipulating. They could come from anywhere at any time, and thus they must be presented in a location independent of whatever the user is doing.
The Growl-style notifications work well because they're near the top of the screen, too. Users are used to status and information in menu bars and so forth, in accordance with the general top-down convention of presenting information.
Thinking it through, I did actually implement a "toast"-style alert for asynchronous issues in one application. It was at the top of the screen, though. I originally put it in there strictly for debugging, but I think I might have left it in the release. So I'm not entirely opposed to the idea, but mainly its placement in the examples discussed here.
And you are right in that the Growl-style notifications in Mac OS are standard now... but those are different from the ones in question here because they are not related to a control that the user was just manipulating. They could come from anywhere at any time, and thus they must be presented in a location independent of whatever the user is doing.
The Growl-style notifications work well because they're near the top of the screen, too. Users are used to status and information in menu bars and so forth, in accordance with the general top-down convention of presenting information.
Thinking it through, I did actually implement a "toast"-style alert for asynchronous issues in one application. It was at the top of the screen, though. I originally put it in there strictly for debugging, but I think I might have left it in the release. So I'm not entirely opposed to the idea, but mainly its placement in the examples discussed here.