I think I understand where you are coming from, wanting RR to drive MMR, but the whole point of Ranked Rating was to smooth your Rank swings and give you an easy to understand point system.
You aren't matched based on Ranked Rating, and I sometimes see the argument where you should be.
"I want to beat silvers, then golds, then plats, etc. to get to my actual rank."
In concept, and not diving deep, that seems like an okay idea. But there is a reason this isn't used in most games. Things like Microsoft developing their True Skill Elo System(which most big games use and license), as well as the Elo system in chess. The reason being is that by beating a Silver player, it does not mean you are actually Plat or wherever you think you belong. It only means you can beat a silver player. Could you imagine us throwing the whole player based into Iron/Bronze and giving them the same RR per win/loss and matching them based on their RR to climb? You would have teams of literally every rank fighting through the ranks. You would just be hoping that you had the immortal that is currently climbing out of bronze on your team. Essentially it would be a huge mess and match making would be chaos.
Plus, we don't have to do that. We actually have a very good match maker, that makes very fair matches(some would disagree, but we've done a lot of investigations into this). If we know you are probably somewhere between Gold-Plat we can start testing you there right away. Right now, you play placements, the game says "I think you are somewhere in the Gold-Plat range" then it places you on the lower end of the area it thinks you belong. After placing you it then tests you exactly where it thinks you belong, which is usually a few sub-ranks higher(Iron doesn't have room to go down so they're the exception). Then if you win games, you will win more RR then you lose. Eventually you will win enough to push your Rank upwards, to match your MMR. Alternatively you could lose enough to drop your MMR to your Rank. Either way, you can't stop converging with your MMR.
There is an issue, that is really hard to solve, and that's players being at the Rank they belong. We want you to improve, but you also need to improve faster then other players in your Rank. Just because you are Gold 2 now, doesn't mean that in two weeks the rest of the playerbase is also improving and that you'll be Gold 2 then. So not only are you playing to improve, you are playing to improve over other players. Remember it isn't you vs. the system, it's you vs. all the other players. So what happens is you converge with your Rank, then because we are generous with stopping you from demoting, there is a good chance you'll get 1 sub-rank above your actual rank through win-streaking. That's when you'll start to see more RR loss then you get from Winning. If you were to Raise your MMR up, to your current Rank, then you would see your RR even out again and enable you to climb.
If you think Ranked is kind of a grind now, making players play purely based on Ranked Rating would be more of a grind. You could argue that MMR is a more complex Ranked Rating system, because technically it's awarding you numbers to climb, or go down, but at increased rates based on your opponents values. If we match made you based on Rank, we would increase that grind ten times over because you would not have an accelerated way to increase your rank(which is what MMR does now).
At the end of the day, it can be hard to accept, but you have to be better then other players in your rank to climb. Ranked isn't meant to be a grind for rank, it's suppose to be a system that finds your current true rank.
Lastly it's impossible for you to have never gotten more RR for a win then a loss. The system never places you over your MMR after placements. The only way this MIGHT occur would be if you were Iron 1, and you never lost after placements so you pushed yourself above your MMR before losing a match(not seeing the Ranked Rating loss that is less then a win because you won all your matches).
Sorry if you're frustrated, I understand the frustrations of feeling hard stuck due to losing more then you're gaining. We are actually talking about trying to find a solution to that perception, but nothing will feel good. Eventually we have to hold you accountable for the rank you truly belong at.