If the band are up for it , it's their choice and right.
The great thing about art is: There are no rules. Try stuff out! FM found themselves in this situation, they found a way to deal with it that felt good. Good! See what happens and go from there.
That's why I think arbitrary generalisations like " X doesn't work/without Y" etc. (especially before anything substantial has happened to support/falsify this hypothesis) kind of miss the point... (The Crowded House universe has been there too, haven't we?)