The keyboard layout is an issue.
While we’re here, let me just add another little form of “geographic advantage” (?) to the mix: you all know cmd-‘ pages through windows of the same application. On a US layout ‘ is right up next to tab, which makes it extremely convenient to remember the mnemonics of cmd-‘ and cmd-tab. In US intl ‘ is shoved down next to lshift, and the premium key top of tab is the useless §.
Why? Apple, why?!