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cmd and down arrow to actually open it. I'm used to it now but it still annoys me!

I always use cmd-o - never knew about cmd-down - it seems to do the same thing - why a different keystroke?

Same here. I just learned about Cmd+down today after using macOS for nearly two decades. I've always used Cmd+o (as in, "open").

But it makes sense. Especially when considering that an Application on macOS is basically a folder (e.g. right click on an app, and select "Show Package Contents"), so navigating "down" into an app would open it.

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