I mean the skill level of the playerbase improve every season so things that used to be hard concepts a decade ago now are standard for even gold or silver players. Also, areas of strength and weakness are a thing, so you could very well be knowledgable about specific things, moreso than your elo, but be weaker in other areas resulting you being in the same elo as everyone else.
In general higher people will preach to exploit these weaker areas when they are noticed, they dont occur 100% every game because every player is different. Sometimes the enemy might permashove 24/7, some times he might just might last hit and be perma scared of you etc. The idea is these things WILL happen SIGNIFICANTLY more frequently in lower elos, where the enemy does something without thinking that is exploitable, and theres a thousand of these different exploitable things that can pop up and people can take advantage of.