Uh, Mission Control, formerly Exposé? Spaces? Full screen windows? The tiling shortcuts that appear when you hover the green window button?

If you don't use them, that's fine, but they do exist and they are well-used.

I mean, it is present. Just because it's not as advanced as you'd like it to be, doesn't mean it's not there. You can move windows, you can cycle between different active windows, you can minimize windows and so on. That's window management.

Yes, super basic, but so is most features of Apple software. Simple, basic and without customization, just like how many Apple users like their software.