Hello,
I really like to enable white/light themes, but unfortunately Start10 have only one font color for app/list/tiles-area (i don't know how to describe it correctly with my poor English), i don't understand why font-color is not automatic or even manual, when light/white-theme is selected. Those white-icons don't need to be dark-colored (yet), because you can enable background color for icons on Start10... but soon you have to, because when light theme is official (on Win 10), people don't see text at all, if they prefer light-theme on Start10 as well.