Does it make the light bigger or move it out of the grill? No. So it doesn't "fix" the issue.
And you can keep saying the One is better all you want to make yourself feel better.
Doesn't make it true.
Better build quality, better screen, better processor, better graphics performance, better night time camera, better speakers, better audio chip, better ROM availability, and better durability. Better phone by default. Whereas the only thing the X wins at is...better day camera. Yay.
And yes BLN lights up the capacitive button back lights which are really bright on the One. Those lights act as notification lights.