It's all in a guilds focus there if you want max stars asap in tb it will hurt you in tw. Or vice versa. My guild does awesome in tw and can punch above our weight class. We're likely in the next tb or 2 finally gonna hit perfect. Its not **** its all choices. Find a like minded guild and go with it. Same goes for your own account. You need to choose your path and do what you want for your style.
Also we only ever see "crap" matchups posted it seems. Nobody comes on so much to say my last 10 tw have been perfect. So I think overall it works. Sometimes bad matches will happen. But if a low % happens to get it then it's still a viable system. It's a mobile game that can't get to crazy I'm sure in coding