I'm tired of this elitist attitude just because someone is a higher rank. Yes, in general, most plat 3+ players have better game knowledge than a bronze/silver but that isn't always the case. I know every champions abitlities, playstyles, relative damage outputs and relative distances of abilities/autos. I know how to prioritize objectives, how to properly set them up, how to rotate etc. I know how to transition leads and I know how to play around win conditions.
My success in this game is probably 85% game knowledge and good decision making and 15% mechanical skill. Unfortunately, this can handicap my gameplay because my team doesn't always have the same objective focused mindset I do. I can't tell you how often my teammates will recall when we can take a free Baron, or how often they just keep running it down mid when we could easily be rotating/splitting to take objectives.
So yes, even though I'm silver it's possible for me to understand balance. It's possible for me to understand why Quinn was OP a few patches ago (ability to one shot a squishy when she couldn't be CC'd because of Edge of Night's sheild) or Rengar (one shot squishies building only two damage items with the rest tank) or even Graves now (pretty similar to Rengar, crazy burst, tankiness, and fitting into pretty much every teamcomp in the current meta).
So while most low elo players don't have much game knowledge, some definitely do. To say that none do is pretty generalist and is simply not true.
