So many don't understand Rengar

So first off this isn't even about how easily Rengar can be countered and denied, it's about his itemization!

If I'm not building full assasin glass canon it doesn't matter how well I'm personally performing my team will still rage at me and blame me for everything that went wrong throughout the entire game. I could be playing tank Rengar and jump the enemy adc, entirely pushing them out of a teamfight while dragging the enemy support and jungler along with us to try and peel me, then my team dies behind me in a 4v2 somehow and I then still manage to get out alive and get back to base for some half decent wave clear to keep out tower alive since I'm too tanky to dive without the enemy carry I chunked too low to push up with his team, and in the end the lost fight was COMPLETELY my fault because I wasn't an assassin who would have most likely just imploded against say that particular enemy team comp anyway....

Sometimes even when going the crit assassin build (which I think is stronger then the armor pen build) I will often times get harassed for it if I'm not hella fed.

Why do people have such a narrow view of Rengar? He has so much variety in his kit that he can perform all these roles, to varrying degrees ofc, and yet going anything other then ghostblade assassin glass canon is flat out ban worthy to an incredible amount of people. It's to the point where even if I win the early game single handedly or even claw us back as a tank peeling or diving in teamfights my team just auto tilts when they see my build and they stop listening to my pings and directions and I eventually have to mute them just so I don't have to deal with the CONSTANT abuse for simply not going the one build they see most often on Rengar, and we end up losing due to lack of communication and half my team tilting and spam typing to the guy who muted them all.....