Steamrolls happen when people are lazy, that’s all there is about it.
When you are getting better, you keep getting matched against better player until you’ve reached your performance peak, and this is when people do start to struggle and experience it sometimes as easy win or steam roll.
No, theres very clearly a higher mix of low players with a 1-2 higher skilled players having to carry them vs teams with all more moderately better players than the prior teams average. Putting a bunch of 7’s vs 1’s and a ten doesnt make for a balanced match even if the "average’ Says they should be the same type of team.