> The security mechanisms in snap packages allow us to open up the platform for much faster iteration across all of our flavours as snap applications are isolated from the rest of the system. Users can install a snap without having to worry whether it will have an impact on their other apps or their system. Similarly, developers have a much better handle on the update cycle as they can decide to bundle specific versions of a library with their app. Transactional updates make deployments of snap packages more robust and reliable.

> By bringing snap packages to Ubuntu 16.04 LTS we are unifying the experience for Ubuntu developers, whether they are creating software for PC, Server, Mobile, and IoT Devices. Snapcraft, a tool available for snap development, makes it easy for developers to package their apps and dependencies. Developers targeting snap packages get a great environment to write and test their applications – directly on their desktop, rather than being forced to use a device or a virtual machine.

I think it is just a poorly worded announcement that implied security isolation on Ubuntu 16.04 LTS when that was not the intention.

Similarly, they are just as secure as apt so there is no loss of security so the claim of the OP's title is misleading.