I assume it doesn't, but thought I'd ask.
I really like the principles behind both gentoo and flatpak, but right now I can only do the gentoo way or the flatpak way (and I've opted for gentoo's for now).
What I'd love to have from flatpak:
- container like sandboxing and isolation
- customizable sandboxing and permissions
What I'd love to have from gentoo:
- powerful build system building packages from source
- global declarative management of compilation options
- easy patches
- easy to add packages that aren't in repos
- support for many architectures or setups
Build everything you use and ackage it in flatpak?
It's not even that hard to build your own gentoo-based runtimes and install stuff on top of that. Fedora does offer that, too, offering fatpaks based on their own fedora based runtime + rpms.