You guys both got nothing on pressing Cmd-W on a MacOS terminal when you intend to copy a selection. :-( I swear whoever designed that UI must have been a vi partisan.

I found it better to make Option (rather than Command) be Meta for this reason.

Yep, for me it's this. I don't know why others are complaining about the other way around, maybe it's because I thought of Emacs as being different from other editors right from the get go, but I doubt I've ever accidentally entered CUA shortcuts in Emacs. But Emacs shortcuts in normal editors while using school PCs was something I did all the time.

Done that about a dozen times today!

Same here! It's just easier to undo :)