Containers, popular as they may be on servers, can only add breakage and overhead to desktops, especially for an established and already much better organized system like Debian's apt. There just haven't been any new desktop apps for way over a decade that would warrant yet another level of indirection.
For example, with flatpak you select a base runtime for your package that contains mostly system-agnostic libraries. With snap, you specify an Ubuntu version as a base runtime and additional dependencies that are Ubuntu packages.
The end result should be similar to FlatPak where you have practically no dependencies as it should package almost everything.
I can't seem to find it. Any pointers would be helpful, so at least I can know the latest state of this thing.
I didn't say "the snap format".
The server isn't, and the client is hostile to using an alternative server. Snaps are a solution, and picking out one piece is deceptive.
Of course that goes against the spirit of FOSS, but there's a bit more nuance there than simply saying "snaps are proprietary".