The news: https://puri.sm/posts/introducing-flatpaks-on-pureos/
I wonder, why not to support AppImages? There is nice AppImage command line manager ZAP with centralized repository. PureOS could directly support decentralized AppImage repository such as Github platform and we could get AppImages as distributed by authors on Github.
About AppImages:
Linux apps that run anywhere
“As a user, I want to download an application from the original author, and run it on my Linux desktop system just like I would do with a Windows or Mac application.”
“As an application author, I want to provide packages for Linux desktop systems, without the need to get it ‘into’ a distribution and without having to build for gazillions of different distributions.”
https://appimage.org/