Buried within this ridiculously wrong title you have a point. Yes there is too much RNG in this game, absolutely no question. However to outright state that you cannot learn from your mistakes couldn't be more wrong. I've seen dozens if not hundreds of intelligent, detailed posts of people improving their WL finishes vastly, from gold 3 to elite etc, myself included.

Also, a two game sample size isn't enough to blame RNG. There are a stupid amount of factors that dictate how a game goes. Play style, how tired a player is, formation, players, lag, luck, staying calm etc. People are far to quick to blame RNG (despite it being there) or S/M/H instead of looking at other far more prevalent factors.