Ranked is set up for failure.
You can't possibly convince me that it's not. I can be on a win streak with players who have over 100 games in Ranked + 100K experience on their champs, and then suddenly get a game in my PROMOS with players who have maybe 2 games in total after their promos, less than 1K experience on their champs, and almost 0 positive KDA in their match history. That to me says Riot specifically tenders to keeping high ranked players in higher ranks and low players in lower ranks without any consideration to bridge the two.