It used to be the case that command-h ('hide application') would also reorder applications, and put the hidden one at the back of the list (i.e. all the way to the right in the alt-tab list).
In recent macOS versions, command-h still hides but it no longer reorders. It preserves the relative position of the app.
I find this annoying since command-tabbing brings me immediately back to the app I just hid.
Is anyone aware of a defaults that sends an application to the back when hiding it? i.e. bring back the old macOS behavior.
Related, and quite old: Can I get back Snow-Leopard-like application hiding (Cmd-H) in Lion?
Edit: correct alt-tab -> command-tab