Matchmaking rant, nothing important to read

Disclaimer: I'm just an incredibly salty player who got fucked by the system, you will probably read what every other salty player writes in any other complaint post about the system, but I seriously needed to vent a bit since this is just too much to accept.

I seriously didn't want to end up saying it but: the matchmaking is broken af right now. It's not about dynamic queue, it's about the matchmaking itself. My story is simple: I carried my sorry ass from silver (I don't remember if 3 or 4) to gold 1 and got 2 times in promo for plat. Everything's fine untill here, climbing is hard since I play tank supports and people aren't too smart in this elo, but at least the skill levels were moslty fair between the teams, but when I finally reach the last game of the second promo to plat something happens: I started to lose every game, no matter how godly or badly I played somehow my team would always int or afk (and I am not joking, they literally were inting nad afking for no reason at all) and the skill gap between my team and the enemy team became so huge that I thought to myself more than once that my team was full of boosted bronzes. Now fast forward 4 days and I'm finally demoted to g2 because I won only about 2 games in the last 10. Now before someone says I'm boosted: I have a solo preference so I got my rank fair and square, I didn't get boosted to my rank by the usual "diamond friend" especially counting that no one I know is diamond and the best they reached was plat 2. Now riot tell me: why the do I keep getting braindead teammates? teams full of peple that either intentionally feed, go afk, flame and overall have both bad macros AND bad mechanics? How is that supposed to be fair? Why am I forced by the system into losing games when climbing as a support is already hard enough withouth gettin thse afkers, inting idiots and flaming kids who play champs for the first time in ranked?. Is it fair that I now am gold 2 with 50 lp when I worked so hard to get to my plat promo, got it thrown (2 times) and started to lose every game after that just because for the game I'm "too good to play with golds" so it puts me with people who have a bad history of flaming, afking, and trolling against a team full of plats and smurf accounts, but after losing so many games now I'm seen as "too bad to be here" so it tries to prevent me from climbing? I was put into this situation becasue I was too good but because of that i'm not good enough now? What kind of reasoning is that? doesn't that mean that the first statement is not true and that I just got fucked for no reason, only to be left with a guted mmr which is kinda impossible to recover since I get braindead teams?. Seriously, do something about it, it's just not fair, if I'm considered better than the average in my division, then just fucking put me with better players and promote my climbing, don't put me with bad teammates to try and save theyr stats, the system is too soft on bad players and too hard on good players as of now, and because smurfing and boosting are so prominent (especially this season) this makes it even harder to actually reach the so called "high elo" even for people who deserve it, now don't get me wrong, I'm no diamond player, at most I'm a plat v scrub, but I sure as hell am better than gold 5 players, else I wouldn't reach a plat promo twice by queueing solo don't you think?