Isn't this an argument for skill-based matchmaking rather than against it? (Since the OP whom you agree with makes a case against optimizing for SBMM, I presume you're also against it)
In other words. I love the idea, and the feel of overwatch which uses sbmm. However the game stacks teams to make matches frustrating.
Some games I'll be the highest rated player on the team and have an amazing game. Despite playing better than my average I will still lose skill rank points if my team loses. Conversely, I can spin in spawn for an entire match, get carried to a win and gain points. By naively averaging team vs team the fun is taken out of the game because too many factors are ignored when averaging leading to exploitable metrics. Exploitable metrics left unchecked causes a games community to splinter, shrink, and grow toxic as more players get frustrated and quit leaving behind a less savory group.