I noticed something very peculiar with how placements work.
I ended Season 6 in Silver 5. After completing placements, I was placed in Bronze 5. I was expecting that so no big deal. So I began looking up all my games and I noticed that I'm being matched as I had been at the end of Season 6. I'm being matched exclusively with and against people who, like me, were Silver(in the range of B1-S3) at the end of Season 6.
It gets strange when I decided to look up people who ended in Bronze 5 in Season 6 and they were being matched with other people who were Bronze 5 at the end of Season 6. This is the thing that confuses me. I expected to be matched with both real Bronze 5s and last Season Silvers but it's only matching me with last season Silvers despite being placed B5 this season.
Can someone explain to me why this is so ? If the system places me in B5 after placements then I assume that my MMR has been set to B5 but I'm not getting any real B5 people in my games. This doesn't make sense.