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What do you mean? I'm assuming that this is a Snap Store feature?

My concern is really more about the command-line, as that's how I (and probably most technical users) install packages.

I guess my reply should be one level lower, it was an answer to "It looks like deb files only can be installed via the terminal."

I think OP is refering to snap being the default application install in the gui now rather than apt.