> The sandbox is STILL a lie

No it is not. If sandboxed means no access to filesystem, sure it would be, but that is not the only definition of sandboxed, that is not the definition of that under which flatpak said they would operate, that is not the definition of sandboxed under which other things operate.

If you want them to use a different definition of sandboxed, by all means submit an issue making the case, but you don't even make it here. You just ignore that and then proceed to act as if your definition is the only reasonable one. And if that was the case the very least you can do is find a reference for your definition.

Try harder with the FUD.