because the color is mean for people who don’t have the mod already?
so if you add a red mod, you will only be able to add green after, or maybe some yellow if they touch something that the red mod did not changed.
and so with red mod, if you want to have all the thing working at start, you need a clear save. for a green one you don’t need the clean save since it only add new content.
for server admin, it is more important to know if they will need to wipe or not, and if the new mod will be compatible with another one that they like.
statera vis for example is a red mod, dino overhaul is yellow, and aku shima is green.
why :
statera : modify all the vanilla item, if you load it on existing save with already build base/tamed dino, what is already in the game will not have the same value as what you will add after. for example a wall placed before installing the mod will not have the new health of the wall.
dino overhaul : modify only the dino, it will stack with any mod that don’t modify the dino, but will need a clean save since the new dino will not replace existing one.
aku shima : only add new items in the game, will stack with any mod, don’t need a new save since it don’t modify vanilla item.
all these mod will more or less work with new update of ark, the green one is sure to work without update, the yelow and red can cause issue with ark update and may need an update to clear the issue.(can be none or only small thing like new item not working, or bigger)
so yeah the PEW is a good ranking. the ranking is not for the modder, it is for the server admin 
@ : your icons are good it is clearer to see an image for people to understand if they see a red icon they will know they could have issue, maybe just edit you first post with the description of PEW in place of your’s (yeah i prefer pew description :x) ?
and ask sina to sticky if he can 