yes but the difference between that S and that A shouldn't cost you more than a single point and should be negligible.
I know people getting 7-12 lp for a win or loss. That's pretty common in plat+ if you have a high enough number of games, particularly if you haven't been rising or falling lately. That's a 8-15% difference per game. That's quite a bit to potentially lose just because you're playing the wrong champion. Heck, I don't even have to have the wrong champion. I can just use the wrong playstyle (say, I play an initiator and we win the fights I initiate but I have to die in the process, and there's no way we could win if I didn't initiate well, then I'll get a lower ranking than someone who plays a safer champion even if they contribute less). Tht difference in LP gains is more than should be accepted.
I mean if you did so bad you pretty much got a free win courtesy of your team you really shouldn't feel so bad about 18 instead of 20.
I wouldn't mind if I trusted the post-game ranking system to be accurate. I don't trust it. I have absolutely 0 faith that the only reason it deprived someone of those 2 points is because they actually played worse.
Either way your rank needs to reflect more of your own performance and less of the results of matchmaking.
I get this complaint. Really, I understand where you're coming from, but it just isn't feasible. The ranking system is just so biased, so unreliable, so ungodly bad, that we can't determine anything but the most blunt assessment of someone's performance from it. I don't trust that an A ranked player contributed more to a game than a B ranked player, and that just breaks the entire idea of assigning lp based on it. It's only good for a laugh post-game. Anything else is using it for more than the system was designed to do.
So long as you play enough games, the ranking system is already accurate. Anything good you do makes you more likely to win, and if you keep doing it you'll win more often than you lose. I agree that it would be really nice if it could do this quicker, but we're not going to do it by introducing a fundamentally broken system.
Then things like games with trolls and people just having very bad games don't affect other peoples rankings quite as much.
These are annoying, but they don't actually keep people's lp down over the long term. Statistically, these are more likely to affect enemy players than they are to affect you (assuming you never troll), because any troll has a 5/9 chance to be assigned to the enemy team. Trolls actually inflate LP gains. They can make it take longer to get to your proper LP rating, but they can't keep you from it.
And again, I do sympathize with you here. I get that it's annoying to lose LP because of a game with an afk or a troll, but introducing this kind of system won't fix that problem, and it will introduce new problems. At the very least, the current system doesn't change your LP gains based on who or what you play. We don't need to make it reward or punish you for your champion choices.
I like the concept of having LP actually be increased by skill, but we need a good way to measure skill, and we just don't have that. We'd have to make a system to do that first.