I mean Id like to break it down like this (this goes for every player)
TLDR: just read it and try to understand these numbers in my point of view
when it comes to solo Q:
50% of your losses come from your own lack of personal skill and inability to do good
half of the chance wether you win or lose is determined by your own skill.
HOWEVER...:
another 10% of your losses come from a team mates personal lack of skill and inability to do good
10% comes from afks/trolls/intentional feeders
10% from players who simply see ranked as "meh its just a game who gives a shit wether we win or lose" (IE: first time -champion- IN RANKED!)
10% from flamers and toxic jerks
10% server related lag issues or personal lag and internet issues
so everyone generally falls into a place where they get stuck and cant climb out of and most players mistake that as where they belong but in reality thats not true, only 50% of them got to where they are stuck
so for example somebody might get stuck at silver 3, well once they hit the point where their skill is good but not so good they can single handely carry games it becomes a luck based game for your team
think of it this way
somebody is stuck at silver 3 and now cant use the 50% skill they have to climb, but at the same time that 50% keeps them from getting demoted
now lets say riot added loss prevention for afks (no matter when or where the afk/leaver happened) lets say you never lost LP for having leavers/dc's/afks that would deduct the about 3.3% leaving just a 6.6%~ with the trolls/feeders
meaning your 50% would rise to 53.3%
MEANING where you should get stuck at would be 3.3% higher than silver 3 (so take bronze/silver/gold/plat/diam/master/challenjour all have 5 division which is 35 divided by 7 is obviously 5 meaning 1/7 of the entire league bracket is in each thing which in decimal form is .14 so roughly 14% (if you do .14*7 it comes out to .98 so its slightly off) of each league bracket is held within each set of 5 so each individual tier is about 0.028 or 2.8%
so with that math if you went up 3.3% from where you were in the standings youd rise about 1 tier and half higher (now being stuck at silver 2 and not silver 3)
now finding out where you truly should belong means you would find where you are stuck at your own personal "50%"
(where most people are currently) that is where you belong in the team environment (based on sheer luck)
but to find where you belong on the personal scale youd have to effectively remove the50% handicap of all those possibilities of teamates
so say in a perfect world riot had loss prevention systems and other systems that made it so the only way you lost rank was if you did terrible and it was solely your fault
that would mean you could at the extra 50% onto your rank
we already established that each ranked was 14% of the total ladder so first off 14 times 3 is only 46 (you would be three things higher IE bronze would be gold silver/plat ect. plus an extra 6% (which would determine what tier you are in
Ie silver V will go up to plat 3-4
NOW what Im saying here isnt that "oh if everyone could not have to worry about their team everyone would be so much higher"
WHAT Ive projected here is the true skill level of each person IE how well they possibly can do
in a sense of
Think of every bronze player in bronze V if they game gave him 100% control over his score, his STATISTICAL limitations (unless he got better at the game and its mechanics) would be gold V and no higher. however it would be 100% up to him to win every game and not the reason he loses to obtain that gold V and when he reaches gold V he would be stuck there because of his own inability
to carry himself
Now youve read this and you might ask why did i bother typing all this?
because even if riot could make it so you were 100% responsible for your own score
YOU STILL would need to get better to get the highest rank because statistically speaking
you can only go 3 divisions and some change higher than what you are stuck at if you are 100% responsible for your score
this is basically the effect of "oh if you win 51% of your games you will climb) which is true
for every one of those 50%'s beyond your own personal skill that is taken away you will climb to a new area and get stuck again until another % is tacked on