Allow me to poke a rather large hole in this... are you playing the game to win? It seems like you're playing competively (which is totally cool, I do as well as the majority of players). That being said, if you're doing ranked and want to get higher, what would be the end goal? Diamond? Master? Challenger? Pro Tour?
Here's the issue: every very high elo player is KNOWN for their champion picks and playstyles. Why on earth would anyone want to privatize their match history..? It serves literally no purpose.
In contrary, what you benefit from (that Pro Players do not) is the fact that you are unknown to the enemy team before the match begins. They don't know your name until loading screen or anything about you. Pro Players are subject to 100% publicized scrutiny before the match even begins.
I fail to understand how your match history matters in lower elos, mid elos, high elos, any of it...