I strongly suspect that they just chose a different creative direction, somewhat more ballad-y. But their latest live-esq album "Woman Worldwide" (styled "WWW") from 2018 shows that they still can make incredible dance/disco electronic music of the same caliber and energy as 2007's 'Cross', but they chose to pursue gentler sounds in their studio albums.

It makes me suspect that their live shows are much more true to their 2007 energy than their studio albums might lead you to believe.