Skill ceiling is both meta and mechanics. That’s why new tech raises the ceiling. What people do matters as much as what’s possible. The game doesn’t have to change, for gameplay to change.
And if we’re talking about smurfing, we’re talking about the game being played badly. Naively. By amateurs. Or at best by experienced played who can’t manage to get their shit together.
Detecting when someone’s doing better than the rank of the current match is how ranking works. It’s not some impossible magic trick. It’s a judgement the game already makes, and that decision already affects people. If you do really well - you get moved to a different group, where you are more likely to get your ass kicked.
When ranking works, the only feedback for your skill is that rank. You will still lose half the time. You will get outmaneuvered half the time. Your execution is on-par with everyone else in the match.
… do you think handing one player an effortless victory is how matchmaking is supposed to work? My guy, one player managing a “rout” is the problem smurfing causes. It’s why Valve is handing out bans.