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• It uses OK | Cancel labels.

Label the affirmative primary button with a specific imperative verb, for example: Save, Print, Remove. This is clearer than a generic label like OK or Done. https://developer.gnome.org/hig/stable/dialogs.html.en

• Cancel button shouldn't have suggested-action styling

I also think OK should be the default action, because this is already a confirmation for an explicit action (closing the window), and it also matches g-t and tilix.

• The dialog looks weird being empty at the bottom. And at the same time the command is truncated and tbh I'm not sure what I'm supposed to do with that info.

Here's the same dialog in Tilix, the command is much more readable.

• Having a dialog on one window blocks the whole app, not just the window the dialog is attached to.

This doesn't happen in Tilix, so it's possible to avoid it :)