You guys have no clue what u are talking about and not the dev team intention. Tiers are just a progression mechanism here, because is similar to LoL doesn't mean it have the same intention.

The real ranking that you want is the Crystal Credit in the Crystal rank and is the same system as MMR in Dota2 ranking.

If you want a LoL comparison, is like the leveling, everyone level up to max and then rank as a separate system. Call it tutorial, call it whatever you want. Moving through Tiers is not the competitive mode, getting higher Crystal Credit is the competitive mode.