They're worried about comp fairness?

For sure, but how do you distinguish casual from organised or even casual solo-queue vs those who do everything in their power in solo-queue to succeed?

Their results?? SR???

I think I kind of agree with you, I just kind of don’t understand how the match maker would only be skewed against your team and not the other that’s all. I mean 6 stack vs 5 stack + 1 for example (is the 5 + 1 all in team chat?), how does it suggest 1 side is better than the other? 6 stack (organised or disorganized) vs guaranteed disorganized solo-queuers?

I probably just need someone to explain to me how it favors one team or another in what is meant to be what it calculates to be a fair match.

I think the team button should stay. I have made new friends through it in the early days, but I certainly wouldn’t go beyond 2 or 3 stack for the reasons I listed above. It doesn’t mean the button should be removed.