The effect of AFK players on gameplay experience (ranked play)

I'm writing this because after many hours of gameplay and many dollars spent on this game, I'm slowly getting fed up with this game. While attempting to grind up the ladders in solo/duo ranked play, I find that the matchups are extremely uneven, but worst of all is the frequency that there are afk players from the very beginning of the game. I understand you have Leaverbuster, and that's great and all, but what does that do for the players that had to play in the game? Nothing really. Tell me, why is it that something that makes the game unfair like Riot-based lag and connection problems gives you a loss prevented, but having a 4v5 for an entire game doesn't? Is the point not to prevent punishing players for something they can't control? Does Riot expect a team with only 4 players to have a fair shot at beating a full team of 5? I would assume not, and if not, why should the team with a full-game duration afk player lose points? I'm not saying the winning team shouldn't get their points, I just don't think it makes sense for the team without a full roster to lose them. I think, that if Leaverbuster catches someone in a ranked game afk, that at the very least based on the duration they were afk, the loss of league points should be mitigated, if not removed entirely. I look forward to hearing other people's thoughts and seeing whether or not there are any Riot responses to this.