packages are not flowing from master into prime branches. when new (testing) branch is created ebuilds/eclasses that creating a branch are coming from a certain snapshot of gentoo portage tree controlled by git SHA. it can be set to false, so it is not enabled by default but is available for testing, it can be set to true, when its ready to be used by default. a good thing is that users are actually allowed to do whatever they want with the branches, however the consequences might be various. wh