I suspect it's not the lack of songwriting that annoys you, but the fact that the songs themselves are utter sh1te, and are performed with all the soul and passion of a cold, wet turd.
There have always been bands/artists that don't write their own songs. However, in the (fairly distant) past, most bands actually performed live, with instruments, even if the songs weren't their own. Now, when it's just choreographed performances, it's hard to feel anything but disdain verging on hatred.