It might be, but it also might not. If you're just cowboy chording, sure, but if you're playing chord melody you'll find the chord you choose is highly contextual based on what you're playing and where you're going. An Am chord is a continuum of notes going up or down the neck A-C-E (G?) over and over-- wherever your hand sits, there's an Am available to you. It just might sound better (or more interesting!) or play easier to grab one set of A-C-E versus another.