Are Ayu's Concerts sort of repetitive?

[AznWizKidz]

While watching some of her concerts, i can't help but notice that in each concert, theres always songs that are an ayu must have song. for example, boys and girls, unite!, trauma, M, and others. I think that she should bring up some older songs like Voyage. That would be a great concert song. As a matter of fact, i don't think she has a concert with Voyage in it. *GASP*
anyways what do you guys think, should ayu keep singing the same ayu must have songs at her concerts or change her style and sing some older songs that have not been forgotten?