That's a very un-Classic-Mac-like way of using windows.

In the olden days, Mac users would tend to have lots of overlapping windows. Dragging anywhere on the window edges would move the window, so it was easy to arrange them as you wanted - almost like shuffling bits of paper on your desktop (strangely enough) and if you wanted to move something out of the way, you could fold it up (window shade). There was no need for maximising or minimising and "zooming" just meant "make this as large as makes sense for this particular document", not "expand to take up all the space on my desktop"

As OSX/macOS has developed, all that document/desktop-style behaviour has been lost.

But when it is full screen then you can't alt tab, right? You would have to use the shortcut to switch workspaces. Maybe I just remember wrong.

They're talking about a window sized to the maximum space as if you click and dragged its edges out as far as they can go or just used a tool like Divvy.

You're talking about the "fullscreen" feature which I always found very weird. For example, ever forget your video was "fullscreen"ed as you try to alt-tab to it only to realize it's a 4-finger swipe to pull it back up. Making the user have to differentiate will always be bizarre to me.

It may be a new behavior (I'm not sure), but you can Alt+Tab to and from full screen apps in High Sierra.

Ah thanks. Then my iOS analogy didn't work.