Clean and classy way to deal with an issue that is huge when it comes to songwriter vs. frontman conflict/discomfort. Singing somebody else's words can be awkward, specially when you end up becoming the person associated with them. Glad they sorted it out this well though.
I always find it really strange when the singer of a band has pretty much nothing to do with the lyrics.
Sometimes people can be brilliant lyricists but can't sing worth a damn and sometimes vice versa. Not everyone who can sing is immediately an incredible writer. Also pretty much the biggest band in the fucking world has this setup, it's not exactly like it's a new or out-there concept, just different.