Snaps don't just suck from an ideological but also practical perspective, as described for Thunderbird. Firefox on Ubuntu has also serious permission issues with webcam support OOTB even experts are struggling with (involving AppArmor, pipewire, snap, and FF device config). and has become unusable for things like browser-only MS Teams on mainstream notebooks.

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.