Catalan this, Catalan that. It scores well because it’s new. Give it a couple decades and I doubt it’ll be anywhere near as popular. Such is the way of GM chess.
It scores well for the same reason Scoth and Spanish Game does well...white has every pro black has plus more.
Not if black does the kid. Unless white has an alternative that reaches the Catalan, oranything even resembling the Catalan with instead of
(I know both sides have other ways of playing it, but the point is white can't extract anything resembling the Catalan without black's approval, where as with e6 it doesn't automatically become the Catalan itself, but it does tend to have similar problems to it).