The difference between "not listen to their teammates" and "deserve to lose" is this small fact about ranked systems in anything that has ever existed successfully:
If I'm the better player, and I'm playing better and communicating well with my team to the best of my ability (which is extremely high statistically, in the top 1% of ranked and top 0.1% of all of league community) then I should have the ability to have more of an influence than the worst player in the match.
In this scenario, everyone has picked the same champion, same runes, same masteries.
Team 1 consists of
1 solo player
2 player premade
and a 2 player premade again
other team is the same.
Solo player absolutely destroys the other team in his ability at the start of the game.
The other premades are always going to communicate with eachother more than everyone else, thats a fact.
If the premade decides "fight here" and the solo player through sheer ability and experience knows without a doubt its a terrible idea, and tells them so, they still will not listen no matter what, due to the trust between the premades.
Thats an old Q scenario. Now do that with 1 solo player, and 4 player premade, or 2 solo players and a 3 premade. The solo players have almost no ability to decide the direction of the game in their own ability because the 3 player premade will always trust eachother more, and you can even test this yourself in a very short amount of time.
Go into a game.
Get super far ahead
Be better than the rest of your team by a long shot (and it should be evident enough that it looks like they are trolling, probably 3/4 games)
Try to be a shot caller, ping everywhere, ping everything you can, talk constantly, encourage people.
Then your team gets a case of the good idea fairy and together in skype in their majority rule, make so many awful decisions and flame you for not following.
Now, with thousands of players speaking of this scenario that happens extremely often, you cannot simply just say it doesn't happen, because it does. I have accounts in every single tier besides master and challenger, and I know it happens everywhere because I can watch streams and see it for those too.
Its the problem with majority rule in a teamgame, that the solo player loses almost all authority in the game, and is simply a pawn for the "team" that usurps control despite vastly inferior ability and experience.
Old Q allowed solo players to "force wins" due to sheer ability. Now, regardless of how well you do, the premade has control and everyone simply plays it off as a "team game" even though the solo player was playing for EVERYONE to do good and win, rather than just the people in skype that they trust the most and couldn't give 2 shits about anyone not in skype.