Some software is very specialisd and even if stable, in itself, it may have the capability of causing problems with other application-software and/or the OS and/or hardware.

There are probably several packages that are highly stable but really not suitable for use by the uninitiated. It could be argued that such packages should remain in the testing repository so as to ward off unsuspecting users, while the package is also given a rating on the basis of its stability/bugginess? Packages on maemo.org/downloads have a stability star rating, so why not introduce for -devel and -testing?

On the other hand, self promotion makes getting packages to release repositories a lot quicker. Therefore more people are able to make use of/comment on/etc. these packages... mmm. Not sure though. If self promotion became a reality, there would need to need to be a way of demoting packages, should they pose Any problem (I think some need to go down already!).