simple example: the app that you want is outdated, is missconfigured on the distro’s package manager (e.g. OBS on arch missing wayland capture). If this app has a flatpak version, it’s likely it’s mainained by the same people who makes the app, thus they can make sure it works fine through flatpak, and since it’s distro independant it works everywhere. App images just bring all their dependencies with them, and snaps idk never used them…

that is accurate

I personally use KeePassXC (KeePassDX on android), it can have TOTP code generation for 2FA for any service. And since it’s a password manager, it’s secured by a master password.

i’ve never seen it used in a pejorative way, and the usage and meaning of the word in collectif consciousness is “theming”. So even if it was used in a bad way, it’s not relevent anymore, since the meaning have changed.