I've asked for SBMM. Yes, one of those people.
Look, friends. SBMM wasn't implemented because devs wanted to waste some time and programming. It was implemented, cause the open random lobbies were unplayable for the majority of players (who is, surprisingly, mostly low skill-chillers, and not tryhards) and in the second season people started to leave.
For me (lower gold\0.5 k\d) and players of my kind (and believe me, I'me not special) it's simple enough - we can play and have fun, we stay. We have too much frustration - we leave. And how we get our comfort play - SBMM or not - it isn't significant. Just so happens, that the SBMM is the best way we have now to make this game suitable for the majority of the player base. Is it ideal? Guess not. Is it working? Definitely.
BTW, Smurfing isn't a big problem either. Multiple smurf accounts made by people meeting all of the following criteria - 1) High gold\Platum level of skill 2) loathing for a high K\D number as a primary goal of play 3) indecent (or just sh1tty person). There is some amount of such people in the overall player population, but I doubt they are statistically significant.