I need to point out that in this case most probably will be installed snap/flatpack package (unless you mean some UI for native package manager), which is a sandboxed package and can/will have issues with things like file access.

The reason tutorials are always based on terminal commands is because it's much harder to describe directions for a GUI, and it's also a lot more prone to change. When the command is just a single line, not images or dependencies, that's obviously better.

That's because debian stable need ESR packages to make any sense, on debian unstable (debian Sid) you get the normal package

Why is Ubuntu even still relevant?

winget was literally robbed from appget.

It actually is a binary. Though you can probably find some version to compile in the AUR

or even: yay -S librewolf-bin

yay firefox does yay -Ss firefox.