Please include champion proficiency when balancing teams
It really does not make much of a difference having 2 members from 1 division up if 4 of the enemy team are all on champs who they have over 150 games on this season in ranked, while all of your team has less than 20 games on their champs. Now It is not a foolproof system I know. But players tend to play the same champions a lot if they really like them. And it is obvious when looking at their game history since it is all 1 champion. So putting all of them on one team is really unfair, arguably just as much as a 4-5 man premade is against a full team of solos (ok maybe not that much but it is still significant).
So if this detail could be included in the way team balancing happens, it would be much appreciated.
Also, I remember hearing about a saying which perfectly describes this concept (might not be exactly correct because I do not remember where I heard it from, so this is the best I got for accuracy): "A weapon is only as powerful as its wielder, where even if the ultimate weapon were in the hands of a fool, they would still be defeated by a stone thrown by a master".