It depends, in this case the packages are parallel installable so no conflicts or replaces. It doesn't actually provide the same thing the old binary did, so apps that depend on qtdeclarative5-friends-plugin have "import Friends 0.1", which will fail with qtdeclarative5-friends0.2 installed. So for those apps to work, they need the old binary installed.
It depends, in this case the packages are parallel installable so no conflicts or replaces. It doesn't actually provide the same thing the old binary did, so apps that depend on qtdeclarative5- friends- plugin have "import Friends 0.1", which will fail with qtdeclarative5- friends0. 2 installed. So for those apps to work, they need the old binary installed.