IIRC for trackpads at least it's been enabled by default for some time (though I believe the default gesture is a double-tap rather than a tap in the bottom-right corner).
But it's been considered a terrible design choice since 1984. It's not one of those things that we decided against long after it was put in place, Unix philosophy types were complaining about the inconsistency of that choice the day it came out.
Though someone's saying that dragging the ion turns it into the eject symbol, which I hadn't noticed until now but is more reasonable.