I was just reading Bozhidar Batsov's latest post on deleting whitespace—nice tip on
just-one-space by the way—and noticed that he had to rebind
just-one-space from 【Meta+Space】because that key sequence is reserved by the OS X for Spotlight.
I've observed that many Mac users map 【⌘ Cmd】 to【Meta】 but I don't understand why. It causes lots of problems with key conflicts like the one Batsov encountered and it doesn't seem to me to offer any real advantages over using the 【⌥ Opt】 key. I suppose one could argue that the 【⌘ Cmd】 key is easier to reach but I, at least, don't find it easier enough to compensate for the problems that it introduces.
So my query to fellow Mac users who map 【⌘ Cmd】 to【Meta】 is what advantages do you see from the mapping? Why is it a better choice than 【⌥ Opt】? Of course, this is another example of Emacs letting you have it your way and while it probably doesn't make much difference on the scales of the universe, I'm curious.