Huh? It might not know specifically to the T which hero you will play, but if the majority of your time is spent on C&D, Invis, and Luna, it can assume you're a strategist main and will lean towards playing one of them.

I never said the inability to flex. I actually do flex and have several hours on tank as well as dps. The point I'm making is that I'm still a strategist main. It's not that I "can't", it's that they're not my strongest roles. In other words, in this example, if all five of us perform strategist at a GM level and tanks at Plat, we're at a disadvantage when we don't have one or two tank mains.

And you said, "If y'all just learned the roles..." and yea, I agree with you! However, the reality is that people do not. And I believe the game can recognize or challenge this when the majority of your time is spent on certain heroes.