Promo matches do not belong in an mmr based ranked system

If the ranked system is designed around an mmr system (even though the mmr is hidden) what is the point of promo matches between ranks? it does not make since for an mmr system to use a promo mechanic since LP is irrelevant and the only number that truly matters is your hidden mmr. Why then is there a fighting game style win 2 out of 3 matches to advance mechanic shoved into the system? If your mmr is high enough shouldnt you just move up to the tier at which your mmr says you should be? This promo series seems tagged on to me as it serves no purpose in an mmr system.

This leads to my second point, the LP. So why is it we have to check a third party program for our mmr score that the entire ranked system is supposedly based on. We seriously cant see our mmr anywhere in the main program? LP is kind of pointless since it is completely based off this hidden mmr score. I figure it is to show progress towards the next tier without it being just some random mmr number that most people would not understand but where it is messed up and does not work properly with the mmr system is when you add the promo mechanic. Then your going between checkpoints of 0 and 100 and end up with something like 98 LP. So in this case on your next win you should move up and have a small amount of LP in the next rank but since the promo system is added in you can only earn 2 LP and start a promo round maybe with a free win. How does earning 2 LP to start promos reflect the change in your hidden mmr? It messes up where your mmr says you should be and puts your through an unnecessary series of checkpoint games.

And lastly, the system gets even weirder when you are at 0 LP. 0 LP should be when you are on the borderline mmr score for the tier you are in correct? So if your mmr drops below your current rank's mmr then a loss at 0 LP should move you down a rank. But once again, the promo system messes this up. When you should be moving down in mmr the LP still stays at 0 sometimes for several games and sometimes for only one with no noticfication of how many games lost at 0 LP will drop you tiers. Then when you do drop you lose far more than you should since an mmr change is gradual and small not massive and sudden. Yet when you drop the whole promo thing screws with the mmr system again. Even if your mmr is where it is supposed to be and you get unlucky, lose a game and drop you don't just drop to a high point value in the next lower tier to easily move back up with a win but instead the promo mechanic has you lose a set number of 25 LP every time and also puts you back behind the promo checkpoint. Then you have to get back to 100 LP and win 2 out of 3 promo rounds just to get back to where you were. That's at least 4 straight wins in a row for one loss at 0. This makes no since whatsoever with an mmr system where you should be fluctuating regularly in small increments without some random checkpoint wall between tiers.

All in all, the ranked system is an mmr system and as such does not need a promo mechanic included. MMR should be visible somewhere in your client instead of being completely hidden. LP does not correctly signify what your current mmr is, and the promo system and 0 LP system seem to conflict with the mmr system and incorrectly have you placed in a wrong tier or wrong section of that given tier.