It does, but the fact that the default is so braindead and annoying, and that I have to configure it to make it usable, is well.. very annoying. Like, why would they think that it is a good idea? No other desktop does this.

Isn't Gnome just copying Mac OS X?

Cmd+Tab switches between applications, and Cmd+~ switches between windows of the current application.

Just checked, and the equivalent of Cmd+~ on GNOME is Cmd+`.

That said, I rarely use Cmd+Tab anymore, I just move the mouse to the top left corner and pick, now that screen could use some UX improvements (i.e. hotkeys for the apps, and maybe grouping, since when you have a lot of open apps, it is hard to find what you are looking for).

It does, but e.g. on Ubuntu you have to install an extra configurator tool to access that setting.

This is incorrect; you can rebind the shell's keyboard shortcuts in Settings -> Keyboard Shortcuts. There are entries for "Switch applications", "Switch windows of an application", and "Switch windows of an app directly"; you want to switch the two that are bound to "Alt+Tab" and "Alt+`".

Without tweak tool, Gnome shell is unusable.

Without tweak tool and several plugins Gnome shell is unusable for me. Unfortunately Gnome shell plugins tend to see zero maintenance so they regularly break with new versions of Gnome shell. I fucking hate that DE.