Trade two old songs for two new songs

[secret love]

Most fans would know that Fleetwood Mac have truncated their set list by dropping Seven Wonders and Songbird. I'm disappointed that I probably won't get to hear these songs when I see them in Sydney later this year. I was looking forward to Seven Wonders especially.

However, why not take this opportunity to add two new songs to the set in their place?

They played two new songs during the 2013 tour without having a new album (the EP didn't come out until a few weeks into the tour).

Why not debut two new songs in Europe and Australia, one of Lindsey's new ones and one of Christine's?