i disagree
bronze = poor team work, still struggle to land skill shots, largely incapable of grouping and if they do its purely by chance.
silver = moderate grouping, will organize themselves somewhat, but dont understand the value of objectives yet or when to do it, still dont listen to pings, have greatly improved mechanics and some players like "well hes a riven main" will be seen on occasion. dont last hit effectively
gold = solid knowledge of the game, decent mechanics, good grouping and objective taking. start to use pings and wards. main issue is team work and team comps and its a toss up to work well with others you just meet. might still argue with team mates.
plat = great players. almost never miss skill shots. not huge champion pools, specific roles/positions will develop, but they can hold their own regardless of lane. they understand counterpicks powerspikes and will actively work on their team comp.
diamond (or higher) = the best of the best. any higher is just splitting hairs.
if you want to compare a bronzie to a goldie you will see some staggering differences in warding, cs, KDA, out trading/outplaying, dodging, and mentality.
tell me this, if you're bronze, do you know what a sidestep is? do you religiously do it? do you try and break 75+ cs by 10mins and 160+ by 20minutes? because you can get a lot more than this, but this is the minimum you should have.