I can say what's inside this thread.
There is a group of ppl changing textures into bright colors (mostly purple) to see better wepons and projectiles to get advantage of that.
Some ppl are more clever and changing models of bushes and hay stacks to become more flat, other ones are playing probably with transparency of some textures to see what is behing some covers.
Some ppl are changing textures to be able to run and play c-rpg on some kind of "wooden pc" (no offence here, i've got problem withh fps and others before i change my pc, i know it hurts)
There is also a group of ppl changing textures to their own to have a badass look of equipment or change a brightness or colors of some parts of their stuff to let it fit better to other parts of equipment. I'm in this group, because i love how longbow and bodkins looks on +3 with hierloom pack.
Some ppl are raging at it, some ppl are saying it's good, but under some conditions. IMO truth is somewhere in a middle