Gragas and Ziggs can predetonate their Q and W, respectively. Why can't Lux do the same with her E?
Gragas' Barrel Roll and Zigg's Satchel Charge can be set to detonate the moment they reach their destination. Why can't Lux do the same with her Lucent Singularity? There's really no reason why she shouldn't be able to.
EDIT: Downvote why?