alt Hacker NewsConsistent but optional, sounds inconsistent to me. Anyways that was 1 example, here's some more.
⌘R Reload in Safari; reply in Mail; reveal an alias's original in Finder
⌘L Address bar in browsers; message filter in Mail; clear to previous mark in Terminal.
⌘I File info in Finder; italics in text; inspector in Terminal.
I can keep going. This is not to say windows/osx is worse or better, just that claims of consistency are not suitable on either
"B" is "buy" in Counter-Strike, and "B" ls "look back" in a racing game.
What kind of consistency did you expect across Mail App and Safari? How do you "Reply" in browsers?