Nothing really wrong with proplay. I will grant you that the community's reaction to it can be fairly awful. I don't know how to explain to folks the meta differs over various elos when all the evidence to back this claim up is highly visible just from spectating games from various elos and should be self evident to players with just a brief moment of reflection and logical analysis. I cant think of a "sport" where some back yard team is expected to run the same plays with the same efficiency of a "pro" team, or for the members of that team to expect their teammates to do it even when they personally know they themselves are unable to do it.
Let me give an example, Blue Ezreal was meta in proplay and it required good cs, and efficient tear stacking. It exploded in popularity, yet many players struggled with it. They did not have good tear mechanics, Their cs was mediocre and delayed his power spikes excessively long, all this because they did not play ezreal nearly enough before this and constantly misused his ability's as a result. Hell to this day folks who where around for this still have a negative impression on EZ that he is a bad adc despite him consistently averaging some of the highest damage (admittedly lots of it is badly targeted so its less then useful). Show of hands folks, who has not heard this quote? "Ezreal does no damage"
I enjoy finding my own place in the game, because of this I get trashed talked for this in almost every game I don't thrive in regardless of my history running this. Bluntly speaking I don't want to copy what the top 0.01% do, I don't want some walkthrough or a guide to hold my hand step by step as I climb the ladder. Its not an experience I'm looking for in a moba, If I wanted to use a guide to win then I would be playing a single player game. I like PvP for the fluid and uncertain nature it provides. Its an act of self awareness to not imitate the pros, not ignorance. I cant play at that level, same goes for any one on my team. If we are able to that's where we would be.