ok so as your example the gold v promos... well ok it screwed you that time but if you are truly good enough to climb through gold you will and that one game wont stop you from achieving whatever rank your skill determines you to be worthy of.
Sure, just be intelligent and you'll make a lot of money, this is why trump, hillary clinton, fucking paris hilton and some other guy are eating caviar for dinner while i'm here eating top ramen and tesla died a homeless hobo and spent several years in a mental asylum for no reason.
Ok i'll bait to the no true scotsman: something something, it's the last day of ranked season, you had your troubles the whole year and you couldn't play many ranked games, in your last promo game that will grant you a free yet worthless skin that you just want to have because it's free and it's nice to have free stuff you lose your game because of a guy with connection problems that ruined it all.
Another example, you're sitting at your office, after having typed a 20 page essay, Smith sits at your computer while you're away grabbing a coffee, he deletes the file and every backup because he was either careless or because he did it to spite you for some reason, you go to your boss and he replies with a smug smile to you "well, if you are REALLY a hard worker, you won't have any trouble typing it all over again". Oh, and if you complain about that in your office you might get fired your account for toxicity.
By the way it wasn't this the topic, i don't care how small is my pee pee, i just want to minimize the non enjoyable games since for anything else the cancerous players that i meet in game take care of everything already, i don't need bad connections adding the candied cherry on top of that.