If I am the support, PLEASE RIOT, do not make me the highest rank/mmr on my team.

If i am support, most of the time I am playing on ao champ and in a way that does not allow me to carry my team if they all feed. And if I am the "best statistically ranked player," we're gonna have issues. If anything, supports should be around mid range more towards the team's average, not the highest or lowest. A solo lane or the Jungler should be highest since they can do the most at early levels when the support is more or less tethered to the ADC. Also, if the support is the team's rank/mmr/elo offset to allow a higher averaging team to play against them, It usually will end up a loss for the support since the overall higher average team will destroy, more often than not, their opposing laners because of just being overall better and higher skilled players.

I would allow for premades to be the exception since they have other means to balance it out, but the solo support should never be the highest ranked/mmr/elo player on their team.